Suterareta Yuusha no Eiyuutan - Story 1-4 "Unnecessary Bait"

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?

- Description from novelbuddy

The world is full of mysteries. Strange, seemingly unexplainable events occur more often than we may realize. A young boy may catch an illness no doctor can explain. An office may catch fire for no apparent reason. And perhaps, someone may die a sudden and unexpected death – their bodies blighted beyond recognition.

Zhuang Xian was abducted when she was three years old and lived in an orphanage until she was sixteen when the Zhuang family adopted her. From then on, she jumped from being an orphan with nothing to a little princess. But she wasn’t satisfied. She wanted to find her birth parents and get their love, but she didn’t expect to instead find a family of jackals and snakes. They took advantage of her trust to annex her adoptive parents’ company and forced them to their deaths.

Her three brothers fled abroad, while Zhuang Xian was beaten and scolded by everyone. Locked in a warehouse, she was forced to endure torture for the whole month with a clear mind thanks to drugs. In the end, she died miserably due to her fiance and her sister’s plotting against her. That cheating scumbag and prostitute! Zhuang Xian swore before her death that if there was a next life, she would be willing to do anything for the Zhuang family, and she wouldn’t let these people deceive her like this again! She would make sure that those who treated her well would have a good life! Zhuang Xian didn’t get the next life, but she did return to the first three years of her adoption. For three years, she stayed under the radar and created multiple identities for herself.

When three years were up, she returned to the Zhuang family and beat up those scumbags, while her three brothers doted on her as though she was a treasure! Outsiders say that the Zhuang family’s adopted daughter didn’t learn well when she was younger, that she was completely illiterate, and that she was stubborn. The reason she was rejected by her previous adoptive family was that she was prone to stealing.

However… She was the Chess Saint, the Gold Medalist Designer, and also the world’s best doctor! All of them were her! There was also the crazy slave-like man who loved to spoil her and loved to show off his wife, “Zhuang Xian is beautiful, right? She’s my wife!”

After the judgment, the ire of God was revealed with the words: “Be cast unto eternal damnation!” And so it was that humans and jinns alike found themselves scattered across the Nine Circles of Hell, left to burn and suffer for eternity. Until after an untold number of eternities, an angelic voice called out, announcing God's decree: “One soul shall earn the chance to return to grace.” Humans and jinns found a shimmering screen appear before their eyes, tallying their sins and something called 'Fragments of Divinity'. “Cleanse away your sins,” said the voice. “Do what must be done!”Now, a human known as Wretched Nameless One—the only human found in the Ninth Circle—sets out on a journey to claim his spot in Heaven, tasked with fighting hellish monsters and devilish hell-dwellers competing to return to grace. Will he escape eternal torment and rise to grace or return to the everlasting cleansing fire once more?