Sensitive schoolgirl Kanon-chan was filled with anxiety over whether she'd ever see her beloved older brother again after he moved out to live alone. When she finally reunites with him, she gradually tries to get closer. Noticing her feelings, her older brother gently asks, "Hey... have you ever kissed someone, Kanon?" Flustered by his words, Kanon begins opening up, slowly sharing her thoughts and enjoying the time they spend together. Then, shyly, she confesses, "I kinda want to kiss right now... and if it's with you, onii-chan, it wouldn't be bad at all..." Surprised, her older brother pulls her onto his lap and starts seducing her. Kanon resists slightly, exclaiming, "Wait a sec!! I'm your sister!! Are you sure this is okay?!" Yet, she finds herself drawn in by his tenderness and care. Deep down, she realizes, "You're so unbelievably cute—that's why it's okay!!" Their bond slowly grows deeper, crossing the line between siblings.