Zig Zag Don

ichina is a 2nd year high school student. she lives with her mother youko whom she hates with a passion. after getting dumped by her boyfriend, she ends up having a one-night stand with her best friend sekitani, who also recently broke up with his long-time girlfriend. will they become more than friends? and who is the strange guy who's waiting at home with youko when she gets back? the desirable tsuu-chan from yogoreteru hima nanka nai is a character in this story as well.