While dining out with his roommate Aka Onda, Fumihiko Matsumaru runs into Tanaka, a woman from his company's accounting department who had previously stood him up on a date. Having just been dumped by her boyfriend minutes earlier, Tanaka compels Fumihiko to drink with her, which provokes Aka's jealousy. After Fumihiko sees a drunk Tanaka home, he ends up looking after her all night, causing Aka to grow suspicious. How will Fumihiko resolve the misunderstanding?