Adult PC Game: SFDev - Waifu Multiverse: Parallel Hearts v0.0.2 Archive

The protagonist, a seemingly normal student, finds himself catapulted into an alternate reality in which demons, angels, and other races coexist in a fragile balance. Endowed with legendary latent power, he becomes a pawn and possible needle in a secret war between opposing forces. With the help of Lilithia, a mysterious demon succubus, he must unlock the secrets of his new reality, understand his true nature, and choose sides.