This is really not mechanical ascension - Chapter 23 - : Soaring Development Speed

The protagonist is an accidental time traveler - he didn't wait, didn't guess, only dreamed, but ended up in history, which he didn't pay much attention to. He was just lucky with his lineage.Ryo is a new member of the Nara clan, from the Uzumaki lineage on his father's side, and it so happened that he was born not at the beginning of the known plot, but more than three decades and two world wars later. Now he has to figure out how to get out of this situation however he can.

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

Stealing Heroine from Protagonist with SystemWARNING MATURE CONTENT!!!!!R-18

Lin Yu finds himself transported to the world of Honkai: Star Rail.Equipped with a divine mobile game development system, his first project is creating “Honkai: Star Rail.”Soon, his game captures the attention of the entire universe.As players reach the Cocolia boss battle, the song ‘Wildfire’ begins playing.“Woah?! This is a turn-based game; how dare you make it so intense!”“The moment this music kicked in, I felt like I was about to take down an Aeon!”Progressing further, they encounter Dan Heng’s sea-parting scene.“I thought ‘Wildfire’ was intense enough, but there’s even more fire here!”“Dan Heng, still denying you’re Imbibitor Lunae? Now you’re a five-star limited character!”Arriving at Penacony:“Huh? Have you listened to ‘WHITE NIGHT’?”“Acheron’s power has been tested – fellow gamers, feel free to pull for her!”“Duke Inferno: Children, this isn’t funny.”“Before experiencing the story: Aventu**ne? Just another profit-driven fraud! After the storyline: May the Mother Goddess thrice close her eyes upon thee…”“What Aventu**ne?! He’s clearly my unfortunate yet loyal bro!”