魔都精兵のスレイブ (Series) favorite_border

[DeepL Translation - needs review] Introduction to Volume 1: The "Demon City", an alien space, has appeared in various parts of Japan.　One day, a depressed high school boy, Yuki Wakura, wanders into the entrance of the suddenly emerged Demon City. There, he meets Kyoka Hazen, the beautiful leader of the seven programs of the "Demon Protection Squad", who declares, "I will make you my slave"...?

(Translator: DeepL)