The Richest Man In the World: Starting From Receiving 7 Billion Red Envelopes - Chapter 346: Physique strengthens, go home!

A mecha otaku is reincarnated into another world as Ernesti Echevalier (Eru). In this world there exist huge humanoid weapons known as Silhouette Knight. Dreaming of piloting those robots, Eru, with childhood friends, Archid Walter and Adeltrud Walter: together they will aim to become a Knight Runner, pilot of Silhoutte Knight.

It’s a affair between a loyal dog servant and his master.

- Description from Novelupdates

Five of the world's wealthiest tycoons descended upon a poverty-stricken district simultaneously, astonishingly just to visit a 20-year-old young man. This young man was their master fifty years ago. Initially, these magnates only acquired some rudimentary knowledge from William Johnson, but that was enough to make them leaders in their respective fields. However, they were stunned by William's ageless visage when they saw him again, as they were unaware that William Johnson had lived for a billion years. He not only established different religions all over the world, but even Alexander the Great was once his student. Yet, after dispersing the tycoons fifty years ago, he chose a long slumber. But now, William Johnson has awakened...

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The strongest Hero in history, Nakamoto Keisuke.

He was summoned to another world in the spring at the age of fifteen years old, and when he successfully defeated The Demon King, he was already thirty-two years old. He had finished his role in another world and returned to Japan, but the reality that had been waiting for him was, “Middle school graduate with seventeen years of blank period” label. He couldn’t find a decent job and had no choice but to spend his days working part-time.

Before such a Nakamoto, a beautiful girl who self-proclaimed had come to return the favor, appeared. “I’m the reward for Hero who had defeated Demon King”, said Angelica, a girl who came from another world that persistently tempted Nakamoto to make her his wife. Together with a high school girl who looks like Elsa, his beloved girl that he lost in another world, Nakamoto with his cheats skills got caught in a harem life.