Koisuru Shoujo ni Sasayaku Ai wa, Misohitomoji Dake Arebaii

Santa Otani, a high school boy, goes the library in search of a new hobby, and meets a flamboyantly dressed girl named Sukui Sukukaze. Santa finds out that Sukui is a talented tanka poet, and asks her to teach him more about poetry. (Source: GA Bunko, translated) Note: Winner of the Gold Award in the 16th GA Bunko Awards.