The shock drops immediately and never lets you catch your breath, suddenly the entire dynamic you've been watching flips, and what felt safe becomes complicated in ways the show actually commits to exploring instead of dancing around it. Romance moves fast enough that you're not stuck in the "will they, won't they" purgatory that kills most harem comedies. The animation stays sharp, the comedy lands, and the show knows exactly what it is: a story about what happens when the rules change and nobody's prepared for it.
Arata Shiunji lives under the same roof as five relentless sisters in their sprawling Tokyo mansion, constantly serving as their personal punching bag. He fantasizes about peace and quiet, about a life where he isn't the family's favorite target for schemes and teasing. Then his father drops a bombshell: Arata isn't actually their biological brother. The revelation should liberate him. Instead, it complicates everything. Now that the biological bonds are severed, what exactly holds this chaotic household together? Are they still a family if blood doesn't connect them? The sisters begin to act differently around him, and Arata finds himself questioning whether distance is really what he wanted after all. What unfolds is a comedy that balances genuine moments of connection with the hilarious dysfunction of a house full of people learning to redefine their relationships. Romance blooms in unexpected corners as feelings shift and reshape. The Shiunji household becomes less about biology and more about choice, proving that family isn't always something you're born into.