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Takuma Sakamoto (voiced by Masamichi Ohta) is known as Diablo in the game, a player with exceptional skills and formidable power, earning him the nickname "Demon King" from other players. In an unexpected turn of events, Takuma finds himself transported into the world of the game. There, he meets Sera (voiced by Yū Shimazawa) and Rem (voiced by Anmi Wakaki), two women who simultaneously cast a slave summoning spell on him to tame him as a summon beast. However, the spell backfires, and instead of enslaving Takuma, they become his slaves. This awkward situation leaves Takuma quite perplexed, as he possesses powerful magic but is extremely awkward when dealing with girls. Meanwhile, lively and carefree Selvia (voiced by Rumi Daimaku) and the seemingly gentle but deeply manipulative Alicia (voiced by Motoki Hara) appear one after another, adding to the mix of charming girls surrounding Takuma.