Kawaiikereba Hentai demo Suki ni Natte Kuremasu ka?

Synopsis:

In the wake of cleaning the Calligraphy Club room one evening, Kiryuu Keiki finds an affection letter routed to him on the clubs work area. Excited at the likelihood of at long last getting a sweetheart, he opens the envelope just to discover the words, "I like you" alongside a couple of the senders undies... With just these underwear to go on, Keiki limits the character to the four young ladies who helped him clean the club room that day: Tokihara Sayuki, the languid third-year leader of the Calligraphy Club, Koga Yuika, a library board of trustees individual from outside plunge, Nanjou Mao, Keikis tsundere-boyish girl dear companion, and most unadroitly, Kiryuu Mizuha, Keikis perfect irregularity of a more youthful sister. Among something like three of these young ladies, Keiki accepts is the person who left him the letter and their underwear so with assurance in his heart, he embarks to reveal which one of these apparently irregular women will turn into his better half!