"Why Am I, Just a Background Character, Getting Involved with the Main Characters? (Tentative Title)" (Currently on hiatus due to being busy)

While being told by his mother that she is remarrying, the protagonist Ai suddenly remembers his past life. Upon realizing that this world is the BL game he used to play in his previous life, and learning that he himself is just a mob character who doesn't even appear in the game's story, he decides to disguise his appearance for certain reasons and observe the development of the game's protagonists. However, if someone without supernatural abilities like himself were to go to the school building where the game protagonists with supernatural powers are located, it would seem suspicious... But then, the protagonist's body undergoes a strange change...!?