Nise no Koibito datta Class no Bishoujo tachi ga, Hontou ni Ore no koto wo Suki ni Natteita Ken
偽の恋人だったクラスの美少女たちが、本当に俺のことを好きになっていた件
A man, pressured into a marriage with his non-blood-related younger sister, lies to her by claiming he already has a girlfriend. Desperate to create an alibi, he asks three girls—Sakurai the raijuu, Senbongi the perfectionist, and his childhood friend Hotaru—to pretend to be in a relationship with him. To his surprise, all three agree. As they compete for his attention, his sister becomes suspicious and increases her monitoring. A romantic comedy ensues as the fake relationships unfold with various mishaps.