15-byou dake: I Know I'm falling

A student becomes involved with a classmate after developing feelings for her sister's fiancé. The two agree to keep their relationship hidden and avoid emotional attachment. As time passes, the sister marries, and the classmate reveals his feelings before leaving for a transfer. The student then acknowledges her own feelings, leading to a mutual realization of love.

Isinasalin pa — orihinal na teksto sa English.