Book Covers are custom pictures for the front of Minnatsuki's book that can be found throughout the spirit world. They are purely cosmetic and have no effect on gameplay.
| Name | Author | Condition(s) | Image |
| Default A | Led | Unlocked by default at the start of a new game. | 
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| Default B | 
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| Pale Park | Mitzyrie | Enter Pale Park. | 
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| Say Cheese! | egguterra | Obtain the Rodentia Eidolon in the City. | 
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| Melancholic Mycelium | WikiOdd | Use the Soulfire Eidolon on the mushroom leading to Weeping Monsters World. | 
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| Phlogiston | Roninnozlo | Enter the annex in the Burning Building. | 
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| Duke of Geometry | Roninnozlo | Visit RGBY Wall World. | 
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| Luminous Trip | rollaby | Ride the minecart in Crystal Complex. | 
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| Remember To Rest | MillieAmp | Find the nightcap kiwi in Crystal Complex somewhere other than the minecart. | 
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| Lamentation | eviled | Interact with Cali in Weeping Monsters World. | 
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| Trade Offer | maple | Visit both Smiling Pen Office and Brutalist Warehouse. | 
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| Fire Friends | MillieAmp | Obtain the Sun Menu Theme in Burning Building. | 
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| WALKMANN | Roninnozlo | Visit the Road Maze. | 
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| Starstruck | NacreMoon | See the Starlight Witch in their house in the Fantasy Forest. | 
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| Dance 'til Dawn | Geno | Witness the Coyote Rave event in Lavender Ruins. | 
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| Spirited Flame's Wrath | akalog | Obtain the Soulfire Eidolon in the Sky Mausoleum and successfully escape. | 
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| worker | MillieAmp | Look at the boss's screen in Brutalist Warehouse after using the Soulfire Eidolon on one of the workers. | 
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| Sisters | NacreMoon | See the Lost Girl and Ghost in Thorn Fields. | 
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| A Mysterious Specimen | NacreMoon | Interact with the container displaying a hand in Dark Archives. | 
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| Pastel Skull | meena | Visit Candy Lagoon. | 
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| Wisteria Grove Girl | meena | See the Drain Girl in Wisteria Grove. | 
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| Monolith | eviled | Enter Obelisks. | 
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| A landscape of colors | Proton | Visit the Tulip Field. (Due to an in-game bug, this cover is currently unlocked only if the last time you visited the Magical Home in Fantasy Forest, the witch was there, otherwise it is locked) | 
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| Singularity | bWF5 | Obtain the Umbra Eidolon in Void Cenotaph and successfully escape. | 
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| tranquil | nekhnona | Visit every Nexus world. | 
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| Ghost Friends | meena | Enter the Ghost Village and see the bar, deity, and basement monster. | 
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| The Wailing Tree | meena | Interact with one of the tree-like figures in Spiral Limb Passage. | 
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| Forbbiden Beauty | meena | See the deity in Ghost Village. | 
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| Prickly Roses | meena | Enter Thorn Fields. | 
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| Unwelcome Intrusion | meena | Interact with the NPC next to the vending machine in Altered Plains. | 
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| Serenity and Smoke | bWF5 | Witness the Smoke Break event in Brutalist Warehouse after lighting Hadie's cigarette with the Soulfire Eidolon and then sitting on the nearby bench. | 
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| Burnt out Bookworm | meena | Interact with the Dust Bunny NPC surrounded by books in Dust Bunny World. | 
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| Maiden of the Garden | noildoof | Find the wandering NPC in Lightbulb Garden. | 
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| Talented Calamari | meena | View the Squid God event in Eternal Communion. | 
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| A Silly Creature | mitzyrie | Find Caleb in Portrait Forest. | 
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| Tasty Snack! | mitzyrie | Take a bite out of one of the moving shrimp in Shrimp Zone. | 
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| x1 Kalimba GET! | meena | Obtain the Kalimba Eidolon in Star Pillar World. | 
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| No Biting!! | MillieAmp | Get eaten in Glass Shards Path after annoying the Glass Eater with the Youth Eidolon. | 
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| Pillar to Everything and Nowhere | meena | Enter the Spirit World for the first time. | 
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| Bloody Vessel | nekhona | Find the Blood Drive. | 
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| Blooming Iris | meena | Interact with the Eye-Lily found on the White Lotus Islands. | 
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| The Director's Cut | meena | Complete all of the puzzles in the Box Office. | 
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| Gleeful Joyride | meena | Purchase a bike and go for a ride in April. | 
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| Death of a Dying Star | NacreMoon | Kill the star NPC hidden in Outer Hospital. | 
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| Imprisoned Beneath the Abyss | meena | See the Imprisoned Flower Girl in the Corrupted School. | 
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| Missing from the Fluther | meena | Obtain the Lumen Eidolon in Jellyfish World. | 
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| Tabloid of a Dancer | meena | Watch Tusuq Warmi dance to kalimba in the Mural Passage. | 
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| Moonlit Dream | NacreMoon | View the Moonlit Dream event in Moonlit Path. | 
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| A Place Left Behind | NacreMoon | See the secret classroom in Corrupted School. | 
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| Formos | rollaby | Interact with the NPC in A Long Journey until it disappears. | 
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| The Sweetest Performance | Proton | Trigger the Performance event in Sweets Circus. | 
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| Soapy Voyage | Coropuchino | See the Bubble Flight event in Soapy Baths. | 
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| innocent days | maengo | Find the picnic area in Wisteria Grove. | 
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| She was always there | Coropuchino | Interact with the Rain Girl in Industrial Waters. | 
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| chromatic tendrils | maengo | See Artist-chan's mural in Soapy Baths. | 
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| At the Dead of Night | Yoopyts | Spot the two figures in trench coats residing on Midnight Street. | 
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| Serenity | Proton | Enter Eternal Communion. | 
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| Journey Without Direction | THEREDSTONEBRO | Enter the Maroon Dunes. | 
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| Dream Vacation | Snoocola | Visit the Roof Tub. | 
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| Light leads the way | Snoocola | Enter the Internal Vista. | 
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| Caretaker of the shores | Snoocola | Encounter the Goddess of Gulls at the Polluted Shore. | 
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| Wandering Together | Rolypoly | Trigger the Wander Together event. | 
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| Words adrift | Coropuchino | Find the Paper Plains. | 
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| What do you see this time? | iEcilpse | Enter the Spirit World ten times. | 
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| Panbata | Widdershins | Interact with the download tab that appears after completing the four puzzles on Terracities. | 
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| Red Roses and Reveries | Proton | See the weeping angel in the Scarlet River. | 
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| goodnight | Proton | Turn off the lights in Sewing Cat Cove. | 
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| Radiating Rusted Runes | caffeinq | Activate the runes in Rusted Runic Towers. | 
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| the duality of zoo | eyoyy | See both versions of Surreal Zoo (with and without using the Youth Eidolon). | 
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| Now Loading Memories... | iEcilpse | Get to the Window Room in Loading Zone. | 
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| Menina Borboleta | JL | Visit the butterfly girl's room in Outer Hospital for the first time. | 
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| Nurse Doll | fzn | Get caught by one of the Nurse Dolls at the Blood Drive. | 
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| Spick and Span | eviled | Enter the Soap Lady's house in Flower Plaza. | 
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| Blazing Soul | eyoyy | Use the Soulfire Eidolon on 100 things. | 
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| Alone on a Winter Night | Rolypoly | Enter the Snowy Path in Snowy World. | 
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| Abyssal Beauty | Rolypoly | Jump five times between the platforms in the Abyssal Bleu. | 
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| Alone? | Mooncaller | Find the fate of the priestess in the Evil Clearing event, located in GBC Village. | 
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| ENTITY | nekhnona | View the Agoraphobia event. | 
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| Rain or Shine... | Yarshmellow | Get the Climate Eidolon atop the Frozen Tower. | 
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| Picture Day | Shakzass | Find the Youth Eidolon in Surreal Zoo. | 
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