Sento and Hakone's childhood friend, Iono, has a crush on Sento, but can't find the right moment to confess. Iono gets a present to give to him, but one night her daydreaming causes her to forget locking up the student council room, causing the school's budget, along with her present, to be stolen when the school is broken into. When she turns to Sento for comfort, he tells her that she is like a little sister to her, which breaks her heart...