One day, Kana Iijima (a student in Class 2-4) is at school by herself during her lunch time, murmuring...

"Being sick" my ass! I already warned Chiaki not to take a dip into a conveniently placed pool at another school during the night, and how the fuck does he not see that it was dirty water!? What an idiot!

Technically, her boyfriend Chiaki is absent for the day as he got unluckily sick for some... idiotic reasons, but then after finishing with her lunch and go somewhere else, she bumps into someone...

OW! Hey! Watch where your going!

At first, she was irritated, but then...

Huh?