When Kaoru runs into his childhood friend Mayu, who is home after her stay in jolly old England, she greets him with a big, wet European-style kiss! The longtime companions share an intense, intimate history together, which causes an upset Aoi to wonder if her fiance's brains are getting caught in his zipper. Filled with feelings of guilt, Kaoru sets out to do the right thing ... but where does his heart really lie?