Gakuen Gekokujou -Ore ga Akogare no Ojou-sama wo Inran Ochi Saseru made- by Atelier Sakura - Adult Sex Game

Yuichi's school used to be girls-only until recently. In fact, Yuichi and his friend Muroi are the only guys in the class and their opinions and wishes are often ignored and they even get bullied by Chiharu, Yuichi's friend.

The school's cultural festival is nearing and Yuichi's class votes for cross-dressing tea house.

Outraged by this Muroi dreams of a world where they've overthrown the rule of the girls.
While musing about his friend's delusion, Yuichi wanders aimlessly in the school thinking that to accomplish this plan, one definitely would have to break Ayaka, the president of the students council and Chiharu, Ayaka's right hand; he stumbles upon Chiharu alone in an unused classroom.
He swiftly sets the plan in motion.