Idle Fish Goes Ashore

A 30-year-old Chinese NEET is reincarnated into the body of an otaku that choked to death on instant noodles. As he comes to grips with his new life, he realizes that this world is subtly different from Earth. The denizens of this world are far better looking, and this new world also possesses futuristic technology as well as mysterious Yin Yang masters! 
After reincarnating, he realized that he was endowed with a miraculous game-like system, which enables him to increase his own stats and transcend the limits of the human body. This system even has a game-breaking ability to save and load in real life!
In this new world that’s akin to a 2-D game, he just wants to enjoy life and head for a glorious future... However, he is quickly embroiled in a complex plot. Can he unlock his true potential and utilize his system to break the shackles that confine him and discover the truth about his previous body’s circumstances? 
Note: This novel have an open ending with multiple possibilities, all fans are welcome to imagine an ending together.

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NEET Receives a Dating Sim System

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"It's also possible that Spirit Worlds aren't controllable and are simply some unexplained phenomena."

"I feel that's an incredibly low possibility."

Several seconds of silence passed between them.

"No matter what the truth is, right now, I'm interested in seeing if the change in the Spirit Worlds has affected Kazuko-san's Domain ability." Something flashed in Seiji's eyes.

The Spirit Worlds' disappearance would affect him as well. No matter how things developed in the future, right now he first wanted to contact Kazufuru and ask how Kazuko was doing.

Seiji immediately dialed Kazufuru's number after he finished his conversation with Natsuya.

"Good morning, Ooike-kun. I apologize for calling so early in the morning. Something major happened last night, so I want to confirm Kazuko-san's condition. Could you allow her to meet with me in a bit?"

Aren’t they supposed to be love rivals?