山之辺　承敬

Homura's father. He's archaeologist and the leader of his team. He forgot the key which open the door he wanted in the mansion so called his son to bring it to him.

Pipe/Hammer: he can break some walls if he has the hammer.

In the true ending he reveals he's Yuki's twin brother (Ayakouji Homura) but she didn't believe him./