Nise no Koibito datta Class no Bishoujo-tachi ga, Hontou ni Ore no Koto wo Suki ni Natteita Ken

"I have a girlfriend!"

Tired of being forced into marriage with my non-blood-related younger sister, I told her a lie. Without any moment to lose, I rushed to plead the raijuu Sakurai, the perfectionist Senbongi, and my childhood friend Hotaru for either one to form a fake relationship with me in order to create an alibi. Just when I thought I could take a breather... Eh? All three accepted my request!? In addition to the scramble to vie for me, my sister noticed something amiss and strengthened her surveillance!? Let the romantic comedy between my fake lovers that's full of mistakes commence!

(Source: Kadokawa, translated)