The Shiunji Family Children

The Shiunji family, who live in a luxurious mansion in the upscale residential district of Setagaya Ward in Tokyo, is known for their seven exceptionally talented and attractive siblings. Among them, the five sisters born in consecutive years are especially famous for their beauty.
Living under the same roof with a group of beautiful sisters that anyone would envy. However, the eldest brother, Arata, is constantly overwhelmed by his five strong-willed sisters, and as a result, he has become timid around girls outside his family.
He cares deeply for his siblings, yet he sometimes imagines what his life might have been like without the five sisters...
Then one day, their father drops a shocking revelation:
"The truth is... you are not actually related by blood."
With that single sentence, their fate changes completely.
The family bonds they believed would last forever begin to shift, and new feelings start to surface.
Where will this love lead, toward family, toward siblings, or toward something else entirely?
A "forbidden yet pure" romantic comedy about a family bound by fate is about to begin.