A workplace romance unfolds when a young woman decides to test the true nature of her newly transferred department head. The man is Hitsuji Kachō, an unassuming man in his forties who appears as harmless as a sheep. Despite his gentle demeanor, office rumors suggest he was actually demoted to her branch from headquarters due to problems in his romantic life. Intrigued by the contrast between his harmless appearance and this scandalous past, the female protagonist makes a bold move. During his welcome party, she uses alcohol for courage and attempts to seduce him.

Her plan to expose the rumored wolf backfires when she discovers the full truth. The seemingly timid and herbivorous sheep of a boss transforms into something much more predatory and passionate than she ever expected. Following their initial encounter, a secret relationship develops between them. She soon learns that the man has two distinct sides: a gentle and kind persona during the daylight hours at work, and a more aggressive, wolf-like lover once the sun goes down.

The story follows their challenges as the relationship deepens. After two months as lovers, Hitsuji is transferred back to the main headquarters, forcing them into a part-time long-distance relationship where they can only meet on Sunday for a few hours. Their weekends together become intensely passionate, with both partners eagerly anticipating their limited time. However, the peaceful dynamic is tested when the protagonist encounters a mysterious young woman on the way home one day. This woman seems to know Hitsuji well, and her appearance introduces a potential rival or complication from his past.

The office worker protagonist is a woman who initially considers herself plain and unlucky in love. The narrative captures her emotional journey from curiosity to genuine affection, along with the anxieties that come with dating a man whose reputation suggests a complicated history. The story is set primarily within the confines of a Japanese corporate workplace and the couple's homes, emphasizing the contrast between their public professional lives and their private romantic relationship. The manga ran for a total of eight volumes and also focuses on the thrill of the male lead’s gap between his sheep-like work persona and his wolf-like romantic side.