My sister became a shut-in... She used to attend ●● High School, but at some point I noticed she had completely withdrawn into her room. Since she never comes out, I'm the only one allowed inside, so I talk to her every night, trying to convince her to stop being a shut-in. But in truth, every night in that room, we lick each other's bodies. In the darkened room, we quietly indulge in this secret game, muffling our sounds so our parents won't find out—brother and sister tasting each other in silence. I have no intention of getting Kanon out of this room. Because if she leaves, this game will end... I, her brother, know better than anyone exactly which spots make my sister feel the most pleasure. Every night, this secret time unfolds within the confines of her room.