Koi no Tsumeshougi
恋の詰め将棋
Ogura, the head of the shogi club, is head over heels for Nunose, the Student Council Vice Chairman. Although he performs his club role ably, when it comes to love, Ogura sucks, so to give him support, the members of the shogi club strip and thoroughly school Ogura in the ways of sex! (Source: Jmanga)