Manga Gacha wo Mawashite Nakama wo Fuyasu: Saikyou no Bishoujo Gundan wo Tsukuriagero

Heihachi Okura was an incredibly talented gamer who was willing to spend anything in order to find what he needed in this game. Once in the game, he receives a mysterious item, which is signed as "Portal to another world." He activates this item and as a result finds himself in a parallel world filled with many terrifying monsters. However, this is the world of his game! Therefore, he has all the necessary knowledge in order to survive in this unusual world. In addition, now he will be able to create a harem of girls for real, and not just in the game!