My Name Is Zero #1

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Perfect for fans of isekai, videogame, and fantasy manga , follow the story of Kanzaki Rei, an avid gamer who is transported into the dangerous world of his favorite videogame!
Kanzaki Rei is an avid gamer, but his debts are mounting up as the expensive medical treatments for his sister don't come cheap... in a fit of desperation he follows a link in a mysterious email promising help only to find him transported into the dangerous world of his favorite videogame. For each boss he kills he earns money, keeping his sister safe, but he risks death with each confrontation!