Celestial Speed: Legacy - Chapter 14: The system shop

Zhou Yu, a reclusive otaku, who did not like to go out of his house, was one day forced out of his house by a series of unexpected events.

- Description from Novelupdates

A book about Austria’s recovery to mightiness!!!A history about House of Habsburg’s struggles and successes!!!The Holy Roman Empire — which was neither holy, nor Roman, nor an empire — now came back!!!

In the eyes of Chi Zuxu, Chi Yi is a typical delinquent with the three big ‘NOs’— no morals, no virtues, no principles. To her, though, he is a classic baddie who is heartless, soulless, and inhuman.

After the girl breaks and climbs through his glass window on the second story, she peeps at him with an innocent demeanor.

“Chi Zuxu, lend me the other half of your bed!” she wolf-whistles at him blatantly. The man admonishes with a scowl, “Chi Yi, aren’t you shameless!”

Inside the cinema, as Chi Yi’s little hands restlessly grope the man’s body without chagrin, she tells him smilingly, “Chi Zuxu, I want to do bad things with you!” Holding a look of woeful disgrace, he knocks her head. “Chi Yi, aren’t you embarrassed!”

It is a lovely love story between a barefaced and a reticent. But, Mr Reticient, please don’t cry when Miss Barefaced finally slips away.

Long Fei, a cross-timer and doujin, is an otaku who traveled to another world. In the original world, he was an otaku fan of Gundam and military science fiction.

He died in an accident and was reincarnated into another world. The Gundam works he had read before his death and the techniques in various military novels could be brought to another world.

How would he use the Gundam that Long Fei created? What waves can be caused in this different world?