Saiko No Sutoka Halloween Edition is a spin-off of the original game; Saiko No Sutoka, in which Saiko Chan is a zombie anime girl who wants to play with her Senpai.
The player's role is being her Senpai.
The player needs to fix & complete her body parts, and also give her food to satisfy her hunger while also assisting her in defeating Yui, so that can escape as soon as possible.

There are three modes with varying levels of difficulty.

* EASY MODE

Saiko gets hungry a lot slower, and the player can spend time alone with her without getting ambushed by Yui. The player can trigger Yui by clicking the main exit door once.

* NORMAL MODE

The intended game play would be as follows: Saiko normally starts out dead, and the player must revive her. Yui is always nearby, so keep an eye out of her as she can ambush and kill either the player or Saiko.

* HARD MODE

Saiko has already been resurrected and is actively hungry and seeking meat, including the player and Yui.