Ever since becoming mates, Naoto and Hazuki have rarely spent any time apart. So when Hazuki is asked by his mother to accompany her on a two-week-long business trip that happens to coincide with Naoto's heat cycle, both are understandably anxious. Not wanting to hold his mate back, Naoto convinces Hazuki to go. But Naoto has more to deal with than just loneliness. A popular alpha student at the school where he works as a janitor has taken an inexplicable shine to him, even going so far as to ask him on a date! Can Naoto keep things under control until Hazuki finally returns?