That which must never be done - Otherworldly Summons,
Zettai ni Yatte wa Ikenai Isekai Shoukan,
College student Yaki Hiroshi has been living a mundane life, when suddenly luck struck and some guy playing a mobile game bumped into him, causing him to fall down - right in front of a train! He got sent to the world Gezeruna instead, where a beautiful girl named Ulfina needed him. To die, that is, to save the world!