He is an honor student and loves reading and reading books. The two have contrasting personalities, but they have one thing in common. It means that the chest is "A cup". The relationship between the two who knew the fact after they started dating quickly shortened. One day, a situation occurred in which supplementary lessons related to the summer vacation trip that had been planned for a long time might overlap. Two people who want to go on a trip somehow get together at Ruri's house and start studying for a follow-up exam.