The Cosmic Gods Slayer (Male reader x Multiverse harem)

Y/N Sakamoto, A young but passionate man, born into a wealthy family specializing in technology and sorcerer, his mother died early when he was 7 years old, his father was a doctor specializing in technology, creating robots and accessories to improve the world, later died of illness, he inherited his father's will and continued to pursue technology, since childhood he had a huge IQ and Six Eyes, even though he was alone at home, he constantly created high-tech products that were in harmony with the environment, as a quiet person.

One day, while he was cleaning the house, he dropped a locked box, he relied on a hint and opened it, and a shocking discovery changed his whole life, so what did his family hide in the end?