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 ... !?

Unable to get the incident from their date out of her head, Miku revisits the rules of the "I Love You Game" to confirm Yuukiya's true intentions . "You can do anything to make him feel excited . " But just how far is " anything" permissible ? They repeatedly use words and actions that make each other's hearts race , trying to find the line ...