So um, Oba was originally in love with Kura but fell in love with Ichimura?
Omg, I remember Chocolate Vanilla Strawberry and I think what you said was right.
I guess this story is just a tip of chocolate vanilla strawberry since that manga has a better depiction of a three-way relationship. For me, the three-way relationship here is too vague that all they do is just tease.
So um, Oba was originally in love with Kura but fell in love with Ichimura?