Shuko is in love with Yoichi, but doesn't seems to acknowledge the fact that he's a teacher or an adult. At their first encounter she was able to learn about his "hidden item," his mole on the left eye lid, and felt special that she was the only one he ever shown. Shuko can be pretty sneaky, for instance she wrote "wifey" on a piece of paper she gave back to him and even kissed him once when his eyes were closed. Every time she tries to get close to him, he sort of brushes her off (not necessarily because he doesn't like her, but because he can't, due to the fact of he being a teacher and Shuko being a student). Since Shuko didn't want to be the one to cost Tanaka-sensei his job, she confronted him that she will give up on him (but probably won't stop having feelings towards him). She eventually moves on from Yoichi, to the point that even after hearing Tanaka-sensai won't be a teacher anymore and their relationship could be possible, she accepts Aya's confession instead stating that she has feelings for him and not Yoichi anymore.