After leaving her teaching job, Hitomi is now a busy cram school instructor. Living alone and looking for help with housework, she receives an unexpected visit from Yui, who has lost her husband to corporate downsizing and was forced to sell her home, now seeking a live-in housekeeper. Yui's sudden arrival triggers profound emotions in Hitomi—Yui bears an uncanny resemblance to a beloved student Hitomi once deeply cared for during her teaching days, a girl she later lost to death. Unaware of this connection, Yui sneaks into Hitomi's bedroom as she sleeps, drenched in sweat, launching both women into a shocking convergence of past and present.