Shima is the main female lead in the short manga Hanauta Nagaruru (花唄流るる lit. Overhearing a Flower Song).
A 2nd year student in Class D.
While cleaning up the old school building one spring, Shima heard a beautiful guitar melody coming from the old building. Thinking it probably a ghost, since no one is allowed to get inside the building, Shima decided to check on the source of melody.