Haike, Arashi Hini Saku Hana TachieHaikei, Arishi Hi ni Saku Hanatachi e; 拝啓、在りし日に咲く花たちへ; 배계, 지난날에 피어난 꽃들에게; Dear Flowers That Bloom In Days of Yore

Kasumi, a serious girl who has just started at an all-girls school, discovers a letter tucked into an old book she found in the library. The letter's writer yearns to have a special relationship with another girl, like how it was described in the book A romance about the the old-school "S" kind of girls-love.