Kaya isn't just an ordinary woman. She's an older sister of Kamui and Kagura. She's also part in a war with Gintoki, Katsura, and Shinsuke. She's also their childhood friends. They have known each other for a long time. They're old classmates and childhood friends. She wanted to be together with them again... Fighting with them... Eating with them... Sleeping with them... And smiling with them... She missed everything with them... She wished all of them to come back... Why don't we make her wish came true? What would happen if she meet them again?