Ohime-sama o Otose!

Prestigious girl academy is in the middle of student council and presidential elections. Three factions compete over the seats. As things heat up, administration gets afraid of losing other faction
parents donations, so mediator is hired. Main character is the guy who can solve any problem as long as he is given full authority over the means. He will handle these three faction leader girls as he thinks fit.

[From vndbreview]