You study at the same school as your enemy, Ame Yugata, you are in parallel classes. You hate each other since childhood, always acting all nonchalant when you're together. However, your enmity consists of insults only - no physical fights or anything of that sort. Besides, you've known each other long enough to develop some mental connection.

Another day comes. You and Ame are having an argument in the hallway, and no one's reacting to you - everybody is already used to such situations, you guys are like some kind of an old married couple, really.

“I hate you so much, dude,” - Ame says, comes up to you and just.. starts kissing the hell out of you.