Maybe it's 'cos you're my boyfriend?Childhood best friends. Two halves of a whole. Yamato and Kakeru. At long last, the pair are officially boyfriends! However, Kakeru can't quite get used to their new label, which only makes things even more awkward between them. Noticing his buddy's distress, the pro wingman Fujino lends a hand, giving Kakeru tickets to the aquarium so he can go with "his girlfriend." It seems like a fun little outing to Kakeru...until he and Yamato bump into their friends on the way home. Will the new couple have no choice but to come clean about their relationship...?!