When I Left, He Found His Way Back - Chapter 1: Cheating husband

Once upon a time, a hero had been summoned to a different world in order to defeat the demon king. After the war stretching 3 years ended the commendable hero slew the demon king. And he was forcibly deported back to earth after being dismissed.

Such bullshit!

Elves in addition to beast race, dwarfs and demon race. Even though I wanted to make a harem in the different world I saved! My dream will not come true on earth, where there is no magic at all. Thus, the hero returns on his own. Without the blunder of being extradited to earth this time, he will build a harem of his own in a different world.

This is a strange world where everyone can build Dream Dungeons. Qiu Ren also becomes one of the many Dream Makers. So, welcome to the dream I built.

Just as nuclear weapons are merely a by-product of science, immortality is but a small gift in the pursuit of the Dao.The patriarch of the new method, the great sage and virtuous teacher, Zhen Fa Zhenren, the strongest cultivator in ten thousand years, is recruiting personal disciples. The reference books are as follows:“Topology in Talismans—Starting with the Little Rain Talisman”“Artificial Intelligence Research in Magical Artifacts: A Preliminary Exploration of Artifact Spirits”“Elemental Decomposition of the Nine-turn Golden Elixir”“Basics of Formation Pathways”Note: Preference will be given to those who have published papers in the Journal of Immortal Dao.

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates