Could You Stay?

Wakatoshi Ushijima's reach is far and trailed in blood. Ruling Japan with an iron grip, from police to politicians, to holding first place among Japan's five biggest gangs. Karasuno. Nekoma. Aoba Johsai. Fukurōdani. Shiratorizawa.
Set to inherit his family's hospitals and research labs, from the outside, it seems he has no weakness. But Shiratorizawa is helping hide his biggest weakness, Akari Shiji. His little half-sister came to live with him at a young age, neglected but growing successful without the gift of the family name; all on her own efforts, she continues to reach new heights.
After avoiding her soulmate thread all her life, this Olympic ice skater is now starting college, and just when trouble arises in the distance, the five gangs call for a peace treaty and safe zone encompassing Tokyo University. To allow each of their younger members schooling, as well as themselves, and aid from attacks outside each other.
Now with Shiratorizawa's secret out in the open for all to see, how will they protect her? From growing dangers both inside and outside the big five? From finding out who they really are, how bloodstained their hands really are? From revenge seekers and takeovers? From her unwanted soulmate, who is one of Shiratorizawa's most significant threats and her yandere stalker?
How long can they keep the best-kept secret hidden?
It will be a game of chess, but who is really playing behind the scenes?