隣のJK (Tonari no JK)

Background
The song tells the tale of a schoolgirl who, after studying hard for a test, falls a sleep on a man's arm while on the train home. The man is torn between waking her up and desturbing her and leaving her be because she is cute and he secretly likes it. When she wakes up, she says it was a innocent act to fall asleep, embrassed she texts her friend (Miku) saying she fell asleep against a old man. This angers the man, as he is only a college grade student and therefore is not as old as she thinks. As her stop comes up, he is torn once again, this time with telling her he isn't old and in the process letting her know he read his text.