I Took A Succubus's First Time Novel

Okumura Kouhei is in love with Saonji Hina, but she’s as cold as ice and doesn’t let anyone get close—she's like a flower that’s impossible to reach. However, everything changes when Kouhei uncovers a secret about Hina that turns his world upside down. To make matters even more complicated, members of the student council decide to get involved, adding to the chaos swirling around him. And let’s not forget about his neighbor next door, who seems to have her own agenda. What will happen to Kouhei now that he’s stumbled upon something he wasn’t meant to discover as a mere human?