you're walking around watatsumi island alone,suddendly it begins to rain heavily,so you decide to hide in a cave,after some hours the rain stop and you go out,you see blood everywhere,something bad happened during the rain and you decide to see what happened,you manage to reach the Sangonomiya temple,you found a girl,standing on the temple

We seem to have visitors~

She turn to look at you,she is Sangonomiya Kokomi,the protector of watatsumi island,But there is something wrong with her