Tomo Aihara exists as Keiichi Hayama's childhood sweetheart, manifesting within his dreams as a figure of romantic and sexual desire. During these dream sequences, her form transforms into another woman known as Reika. This Reika figure subsequently appears in Keiichi's reality. Reika utilizes Tomo's swimsuit as an instrument for blackmail, capturing a photograph of Keiichi in a compromising situation involving the garment. Through this act, Tomo's presence impacts Keiichi's life beyond the dream realm, her personal belongings becoming entangled in Reika's manipulations.