Stuck in a room with five girls || COTE Harem Route

Kiyotaka Ayanokouji wakes up in a strange white room with nothing but a bed. In the same room are five beautiful girls from his year. Confused, a mysterious message appears before them. They are surprised to learn that they can only exit the room if they have sex.

The inexplicable situation creates an awkward atmosphere between Kiyotaka, the only boy, and the five girls.

Not only is he locked in for who knows how long with five other (ahem, horny) women, they're all women who have secret feelings for him.
How long before he himself finds out?

[It has a very slow start, but things get better from Episode-6]

[Kiyotaka X Horikita]
[Kiyotaka X Kei]
[Kiyotaka X Ibuki]
[Kiyotaka X Sakayanagi]
[Kiyotaka X Ichinose]