Prologue: Save Our Souls

Immediately after the events of the MHA World Heroes' Mission movie, a call from a hostage held by an elusive Villain group named the Ascended One's was received in Corestella, a nature loving city in a distant prefecture of Japan. Midoriya, Bakugou, Todoroki and their newly assigned guardian/babysitter Kamiji are sent there to assist in putting an end to this cult-like organisation of madmen once and for all

... Or Re:Zero characters are turned into OCs, thus allowing Midoriya and the rest of the Pro Heroes to experience the Sin Archbishops - or their stand ins at least - brand of insanity and charm!

Please show me mercy as I haven't read the Re:Zero light novels