Venus Mission - Moto Koroshiya de Youhei no Chuunen, Yuusha no Ansatsu wo Iraisare Isekai Tensei!

Synopsis:

The goddess was requesting that thirty-two heroes be killed!? Suzuki Takashi, 42, was formerly employed as a hitman and mercenary. Despite dying from disease, his assassination potential caused him to be reincarnated into a different universe. He battles the unmatched heroes using the cutting-edge fighting methods he learned in his past life, the traditional martial art "Shingu-ryu," and his just discovered strong magic. A thrilling fantasy with magic, swords, and firearms starts now!