Kanojo no Ane to no Ikenai Kankei ~Sakippo made tte Yakusoku na no ni...~ The Motion Anime

The protagonist sighed, looking at his bandaged hands. The doctor said it was nothing serious and it would heal soon. But the hero was still dejected. His girlfriend Chisa went on a business trip and the hero had to stay alone with his injury. However, he was lucky that Chisa had a sister named Hinami, who out of the kindness of her heart decided to take care of the grieving hero...