Shougeki Gouraigan

Mysteriously transformed into mini versions of themselves, Goku and his friends travel to the Demon Realm to uncover the truth and find a cure.

Murdered by a demonic being, 15-year-old Yuji Sakai has his life force replaced by a flame that dims with each day. When the flame dies, no one will remember he was ever alive. This is how he meets Shana: a warrior with a burning sword, and the will of a god as her guide. The two form a bond as Yuji becomes Shana’s accomplice in her battles to keep the balance between the ordinary world and hers.

Now happily married and with a son, martial arts champion Goku must defend Earth from a series of extraterrestrial invaders bent on destruction.

Saitama is a hero who only became a hero for fun. After three years of “special” training, though, he’s become so strong that he’s practically invincible. In fact, he’s too strong—even his mightiest opponents are taken out with a single punch, and it turns out that being devastatingly powerful is actually kind of a bore. With his passion for being a hero lost along with his hair, yet still faced with new enemies every day, how much longer can he keep it going?