Arifureta Shokugyou de Sekai Saikyou (WN) - Chapter 491

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

Branded a scammer, a thief and a con artist, Si-eun became a fugitive following the betrayal of his friend and sworn brother Javier, the one who stole his life's work, his business from him and framed him for its downfall. Hunted by loansharks and enraged investors for months, he wandered from city to city until his luck eventually ran out.At the moment of his pathetic death, a god intrigued by his desperation to live offered him another chance at life—Only for Si-eun to awaken inside a familiar world, the world of an MMORPG game he once played, even worse… he inhabited the body of Azazel Von Astavore, a useless extra destined to die in every playthrough of the game.

In the world of Norse mythology, a human boy falls in love with Waltraute, the fourth Valkyrie sister. He wishes to marry her, but Waltraute gives him an impossible challenge to deter him.

Nevertheless, the boy is determined to carry out the dangerous task and to marry Waltraute afterwards.