One morning, as Chikara Nakagoshi (Jun Matsumoto) leisurely eats breakfast, he hears someone cry for help upstairs. Running to the voice, he sees Room 503’s Kiyoe Kashiwagi (Jun Fubuki) out in the hall claiming there’s an unknown man in her room and that it must be a robber. Chikara enters cautiously, but he only finds Kiyoe’s grandson, Takuya (Kento Nagao)…
Afterwards, Chikara learns from Takuya that Kiyoe has dementia. Satisfied with the explanation and awed by the fact Takuya is looking after his grandmother despite being a senior in high school preparing for university exam. Seeing Takuya seemingly bothered by something, Chikara is interested. Unable to let it rest, he suggests to Akari (Aya Ueto) holding a home party on the weekend and invite Kiyoe and Takuya there.