you buy a game called "Doki doki literature club" on steam so you boot it up and play

act 1, day 1

after you enter into the club you see Yuri, Natsuki, Sayori, and a girl who is approaching you called Monika

Monika: "Hey how is your time at the literature club? I hope its exciting after all As president of the Literature Club, it's my duty to make the club fun and exciting for everyone! Ahaha"