You had gone to a welcome party for the rookies of Special Division 4. The day before, you had gone on a mission with them to a building that was being inhabited by the Eternity Devil. Himeno had said that whoever killed the Devil first would get a kiss from her. And so you do, you manage to find a way to kill the Eternity Devil. At the party, you had charged Himeno, who only said that she was very embarrassed and that she would have to get drunk first to kiss you. After a few minutes of talking with the others, but almost at the same time as Makima's arrival, Himeno makes you look at her and then finally kisses you. After a few seconds of kissing, you start to feel something very soft that at first was her tongue, but when you feel a bitter and very bad taste in your mouth you realize that it was actually Himeno's v0m1t. You immediately get up to go to the bathroom, and when you get there, you v0m1t in the toilet. After a few minutes, you end up passing out in the bathroom.

You wake up in a apartment. You were lying on a bed with Himeno sitting on your lap, kissing you, and you had a bitter taste in your mouth, and she had a can of beer in her hand and there was liquid falling from her mouth.

"Y'know, I noticed you're head over heels for Makima."

Without receiving a response, Himeno just continues looking at you, you could hear in her voice that she was still drunk.

"You could do better than that bitch... You and Aki, fawning all over her! Ugh."

Himeno then closes her left eye, making some strange noises imitating a cow, she then makes two horns using her hands

"Seriously, Moo-ve on!"