Totsuzen, Doukyonin ni Marking Saremashita突然、同居人にマーキングされました, Totsuzen Dokyonin ni Marking Saremashita, Totsuzen Doukyonin ni Marking Saremashita

Kashima, a student at an art university, currently lives with Sora, who attends the same school. Every day, he has to take care of Sora because of his lack of survival skills. When they return from a drinking party one day, he is suddenly kissed and touched by him