https://j8jp.com/manga/kaijuu-8-gou
<毎週金曜更新>かつて憧れた世界とは遠い場所で働く男におとずれる予想もしない出来事…!その男、怪獣になりかつて憧れた場所を再び目指す…!
A man, unhappy with the work he has had to do in life, is involved in an unexpected event …!
He becomes a Kaijuu, a monstrous creature, giving him a new chance to achieve what he always dreamed of!