There's a bad ending, a best ending and a special ending. Doki Doki Literature club is an atypical visual novel game with non-traditional means of obtaining the endings. The order in which you can lock in is Sayori-Yuri-Natsuki. If you don't lock in with anyone, the game's bad ending will play. If a person has not gained enough affection with you, then it will not lock in, and the game will continue.