Konna Omiai Hansoku desu.

The Suzuki household is home to five siblings—four brothers and one sister—who live independently while their parents work abroad. When the youngest brother's birthday arrives, the family receives a special video message from their parents overseas. This heartfelt communication sets off an unexpected chain of events that challenges the siblings' understanding of their family bonds. As the brothers and their sister navigate this new reality, they find themselves confronting questions about love, family, and relationships that go beyond traditional boundaries. The story explores the complex dynamics between the siblings as they face an unusual situation that tests their connections to each other. This provocative tale delves into themes of forbidden desire and family ties, following the siblings as they grapple with emotions and circumstances that blur the lines between familial love and romantic attraction.