Kei and Mizuhos honeymoon summer vacation in Okinawa is interrupted when they discover that Hyosuke and the gang are vacationing there, too. Though the honeymooners cant seem to get any time alone, the buds of love begin to blossom for another unlikely couple. Things dont get any easier when they get home. Mizuhos sister, Maho and her mother, Hatsuho, visit Earth to, respectively, express their protest and delight to the newlyweds. Now Kei has to dodge the death threats of his sister-in-law and the romantic advances of his mother-in-law, as well as play cupid for his friend! Will Kei ever have the chance to say those three simple words to his teacher?