Days of social anxiety and working at a black company. Repeated mistakes at work, endless overtime, drinking heavily out of frustration, and constant sleep deprivation. During a usual drinking party, the beautiful next-door neighbor, married woman Tsukasa, walks in through the entrance. Did she mistakenly enter my room, or was it some kind of coincidence that we ended up drinking together? Just her presence heightens my tension, and when she discovers I'm a virgin, she smirks and straddles me. Wrapped in her warmth and kindness, I open up about the deep-seated worries I've kept hidden and begin to sort through my emotions. A fleeting moment where a strange encounter brings about a noticeable change.