Fuyu Yamase had felt completely drained - mind, body, and spirit - due to the exploitative work at his job and near-daily sarcastic comments from his boss... But one day, he reunited with Ito, his ex-girlfriend from college. Excited about his sudden encounter with her, he immediately invites her out for a drink, where they have a lively conversation reminiscing about old times and grumbling about things currently happening to them. But just when Fuyu thought he was happy having that kind of friendly relationship with her, the two of them make an alcohol-induced mistake one night...