I'm in the Small Garden, I'm Going Back to Izayoi

I traveled through time and became the reverse Izayoi. At the age of seven, he awakened to the dimensional chat** system and was invited by Tekken Garp to enter the world of One Piece. In just three months, he became the most powerful general in the navy. He guarded the G10 branch in the new world and defeated the four emperors. He was known as the Emperor of the Sea. When he was nine years old, Izayoi was invited by Uzumaki Kushina to enter the world of Naruto. He graduated from the ninja school at the speed of light in one month and became a Jonin in three months. Then he immediately went to the battlefield to capture Sansho Hanzo alive and ended the second ninja war. He was known as the God of War in Konoha. When he was twelve years old, Izayoi was invited by Sosuke Aizen to enter the world of death. He just took a wooden sword and chopped down Kenpachi Zaraki. He became the new captain of the 11th Squadron and worked with Aizen to plan the Hōdama plan. When he was fifteen years old, Izayoi was invited by the Child Emperor to enter the world of One-Punch Man, and he directly became an S-class hero with perfect scores upon his debut. Unfortunately, Saitama was not bald at the time, so he was not able to fight to his fullest. Now... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.