A buy who loves the bishoujo game "Kokorone Heartful" makes a wish to be the protagonist of the game.
Title is a pun on the Japanese meme phrase "Sore nante galge?" or "Sore nante eroge?", meaning "Which eroge/galge was that?" (See this blog for details on the phrase)
This pool is a sample of the full comic, available as a PDF on DLsite English.