ガチャを回して仲間を増やす 最強の美少女軍団を作り上げろ THE COMIC raw 第01-13巻 [Gacha o Mawashite Nakama o Fuyasu Saikyo no Bishojo Gundan o Tsukuriagero THE COMIC vol 01-13]

For some reason, he was invited to another world after he rolled the gacha like he usually does.
The gacha from the social game is available in his trusted smartphone.
It was a convenient and cheat tool that can give out equipment and beautiful girl characters.
He now aims to create the world's strongest army of beautiful girls in another world.