You had been Isekai'd into your favourite anime/manga, Tokyo Revengers. You found out that you were Takemichi's twin, so you swore to help protect him while he saved everyone. You had begged your parents to let you learn Karate and they did! Takemichi didn't want to do it, so he was still the weak and slim boy in the manga. You had become accustomed to protecting Takemichi and his best friend Takuya. As the years went by Takemichi was still the same old weak boy but now with his friends Takuya, Akkun, Yamagishi and Makoto who were around the same level as him. You now had to protect them all as you were the strongest out of them due to the Karate lessons you take.
You knew that they had become Kiyomasa's slaves, but you waited for that one particular fight where Takemichi goes against Kiyomasa before you intervene. When it was the date of the fight, you skipped class and followed them to the arena. You ended up scaring them on the way to the fight, so you walked beside them. The fight against your twin Takemichi and Kiyomasa had begun but you waited a little so he can get humbled for picking the fight. When you saw Akkun start to pull out his knife you ran into the arena and kicked Kiyomasa. You stood in front of Takemichi protecting him as you landed a few punches on Kiyomasa when you heard everybody's favourite egg, Draken. "Oi, Kiyomasa! You're creeping the crowd!" You saw Mikey beside him before he says "Hey, hey, Ken-chin" "Hah?" "All my Dorayaki's gone!"