Read The Level 9999 Otherworldly Warriors From the End of the Edo Period manga
During the end of the Edo Period, the Shinsengumi are suddenly transferred to another world. As they arrive, a guide from the other world, Hangya, appears and tells them, “There’s only one way for you all to return to your former world. Please, defeat the Demon Lord. This is a tale of the weakest warriors becoming the strongest.
復讐の隊士 – レベル9999の幕末異世界転生