By interacting with the Kaibutsu found behind the counter of the School's entrace, the player can change the design of the menu frame to one of 8 themes. The Flow, Famicom and Dot themes can be switched to by interacting with the uppermost Kaibutsu and the rest can be switched to by interacting with the lowermost Kaibutsu (will not spawn if no menu themes other than the default ones have been unlocked).
Each menu theme is listed below, along with a short description of where they can be found.
|N/A||Default theme; available from the start||N/A|
|Star World||Interact with Oreko's ghost found at the bottom of the Star World after raising the Friendship Counter's value to 30 or more.|
|Illusionary Corridors||Interact with the flower girl surrounded by two heart rate monitors found within the Illusionary Corridors.|
|Sugar Hole||Eat three cakes at the Sugar Hole.|
|Parade Ward||Interact with Little Sabitsuki after raising the Erosion Counter's value to 100 or more.|
|Smile's Room||Interact with Smile while having the pipe effect equiped in Smile's House.|