The first story really makes you beg for more, but at the same time, it ended at the perfect moment. Second story is meh; cliche and just... that. Third story is painful, 2 parallel unrequited loves; again, like the first story, makes you beg for more, but ended at the perfect moment. Last story is the best in terms of length though; unlike 1 and 3, it has an actual conclusion.
Valentines Day rolls around again and Daisuke knows he won't receive any chocolate yet again. However, he opens his locker to find chocolate with only a mail address attached. Who gave him the chocolate and why?