Review Detail of Kibbinz in High Human in Crossed Worlds - A HP x DxD Fic

This story starts out great however after a certain point about 140 chapters in, it stops following the MC and follows Rias and her peerage for like 30 chapters then when we finally get back to the MC he doesn't do anything anymore. People try to kill his family and he just pranks then and sends them on their way. He does nothing, and the characters seem fine with it. People try to kill his kids and he doesn't kill them, and his wives are fine with it? Also he does a lot of things (or doesn't do a lot of things) just so that the plot can continue as normally as possible for some reason.