Blackstone Code - Chapter 151:

With the sudden announcement of the launch of the holographic virtual network, Chen Mo, a hacker, received a special commission to hack this system in a bid to halt advancement.

To complete his task, he enters GENESIS – the holographic virtual game touted as the most secure – to look for a way to hack it. In his search, he inevitably becomes a terrifying force to behold.

- Description from Novelupdates

Hasami Tatsuro and Yashiki Ai, two ordinary teenagers, experienced an earthquake while on the way home from school.The earthquake cracked space and transported the two to another world.Landing in an unknown forest, the two initially began to grieve. However, unbeknownst to them, a system had installed itself into their bodies, granting them the ability to gain skills and statuses.Hasami Tatsuro obtained the “Level Eater” skill. “Level Eater” allowed the host to devour others’ levels/skills and make it his own.Yashiki Ai obtained the “Valkyrie” skill. “Valkyrie” allowed the host to obtain and use any offensive skills from different classes, without the need to specialize.With their cheat skills and teamwork, they managed to venture out of the forest and explore the new world.This is a story of two ordinary kids.

By the time I reached thirty, I hadn't managed to provide any of the happiness I wanted for my wife.I also still couldn't become the support my parents relied on.At this turning point in my fate, my income suddenly began to increase randomly.(A daily life tale in a wealthy family setting, featuring a single female lead and no harem.)

On his usual way to home Mikado Tsuchio fell into a hole that suddenly opened on the ground. Just like that, Tsuchio falls in a different world, he lands on a Grappler Wyvern and manages to tame it.

Tsuchio decides just like that to live in the other world, the reason for his quick decision: he wants to make a monster girl harem.