Isekai Nidome no Ossan, Dou Kangaete mo Koukousei Yuusha Yori Tsuyoi

Takayanagi Riku is a 32-year-old office worker with no particular characteristics. He actually has a special past in that he once saved another world as a hero, and now he lives in Japan as an ordinary office worker. But one day, he gets caught up...