On the verge of graduation, Yuu's dormitory life as a student is coming to an end. Coming toward him with a smile across the street is Haruka, his stepmother, who has secretly cherished feelings for him. On graduation day, the two reunite and grow intimately close once more. Haruka rejoices at Yuu's growth, gradually opening her heart. However, overcome by drunkenness, she lets her guard down and reveals a vulnerable side. Desperate to protect her, Yuu takes her to a hotel. Yet Haruka is fully aware of Yuu's feelings, and with the tender thought of "a gift to the now-adult Yuu," she gently kisses him. Their relationship takes a bold new step forward.