The Hundred Line
The Hundred Line: Last Defense Academy is a tactical RPG developed by Too Kyo Games. The story was written by Kazutaka Kodaka and Kotaro Uchikoshi, the character designs were done by Rui Komatsuzaki and Shimadoriru, and music composed by Masafumi Takada. Most of the team who worked on The Hundred Line also worked on the Danganronpa series.
The game centers around a high school senior named Takumi Sumino who lives an uneventful, normal life in the Tokyo Residential Complex with his parents and his childhood friend Karua Kashimiya. At the start of the game, the TRC is attacked by monsters and Takumi is forced to fight them after being given the power of hemoanima by a strange mascot-looking character.
Takumi, along with other teenagers his age, are forced to join the Special Defense Unit. The purpose of the SDU is to protect their school, Last Defense Academy, and the contents of the school's defense room from invaders for 100 days. Last Defense Academy is humanity's last hope against the invading forces that seek to destroy humanity.
There's 100 possible endings and I've gotten 14 of them, as of July 9th, 2025.