Kōgeki Shōjo Falselion: Tsundere no Theory

Kōgeki Shōjo Falselion: Tsundere no Theory is a Japanese adult science fiction visual novel featuring transforming heroes.

The player takes on the role of Takeharu Tsubakiyama, an otaku who gains the power to transform into a powerful hero upon coming into contact with an artifact with the power to reshape reality. Unfortunately, this artifact, the "Hajimari no Sho", also starts to erode the otaku concepts such as "tsundere" and "moe" all across Japan as a side effect of coming into contact with Takeharu's brain. Takeharu needs to work with Len Fanaphy, an investigator for an interstellar peacekeeping organization called the Galaxy Force, to recover the Hajimari no Sho from intergalactic criminals and restore normality.

At certain points throughout the game, the player must make decisions which influence the development of the story.