Fuuto relates to her because both their fathers are missing and does all he can to help her family recover, from asking his Yakuza grandmother for help to convincing Eriko's father not to commit suicide.
He can to help her family recover. This is from asking his Yakuza grandmother for help to convincing Eriko's father not to commit suicide. This is what Fuuto relates to her. Both their fathers are missing. Both their fathers does all.