"The Kawai Complex Guide to Manors and Hostel Behavior" centers around Kazunari Usa, a high school student who moves into the Kawai Complex, a boarding house, after his parents relocate for work. The boarding house is home to a quirky group of residents, each with distinct personalities and habits. Usa’s life takes an unexpected turn when he discovers that Ritsu Kawai, a girl he has admired since middle school, also lives in the complex. Despite her aloof and bookish demeanor, Usa is determined to grow closer to her.

The series explores the daily lives and interactions of the residents, blending slice-of-life moments with comedic and romantic elements. Alongside Usa and Ritsu, the cast includes Sayaka Watanabe, a flirtatious and outspoken woman who often teases Usa; Shirosaki, a stoic and mysterious man with a penchant for alcohol; and Mayumi Nishikino, a mature yet clumsy woman who works as a nurse. The dynamics between the characters create a mix of humor, awkwardness, and occasional heartfelt moments as they navigate their shared living space.

Usa’s attempts to win Ritsu’s affection are frequently complicated by misunderstandings, his own insecurities, and the unpredictable behavior of the other residents. Ritsu, while seemingly indifferent, gradually reveals a softer side, though her reserved nature makes it difficult for her to express her feelings. The series balances lighthearted comedy with subtle romantic tension, offering a glimpse into the challenges of young love and the bonds formed in unconventional living situations. The narrative progresses through episodic encounters, highlighting the characters’ growth and the evolving relationships within the Kawai Complex.