High school life begins, and Miku, with her natural cheerfulness, quickly settles into her class. In contrast, Yuukiya struggles to find his place and is already somewhat of a loner! Miku, as usual, playfully teases Yuukiya, but Miku's friends show interest in him and unexpectedly grow closer to him. Seeing this, Miku begins to feel a vague unease that she can't explain ... !?