From Aerandria Scans:
Sachika got involved in a traffic accident, and she fell into a coma. The moment she awoke from it, the one waiting for her wasn't a family member or her boyfriend Tetsuo, but a man she didn't know. He introduced himself as Kohara, one of her relatives, and he took her to his house. Sachika gradually felt that something was wrong, and she came to know of a shocking fact...