Housekibako ni Ai wo Tsumeyou

At five, she started humming melodies. At ten, she found her treasure. At 14, her world lost its spark. At 17, she starts to hear the music again. Mone Tsukimori, a slightly cheeky high schooler, has someone she can never forget. What is Mone's past that only Anji-senpai knows...?

(Source: Kodansha)