Kei, who lost her husband, lives with her son. The son has become a recluse, and Kei takes care of him. However, this is just a facade; they have been aware of each other as members of the opposite sex since before her husband's passing... Step-mother and step-son... Their feelings for each other have grown daily and have now reached their limit. Kei decides to resolve this situation by inviting her son on a hot spring trip... Although they are parent and child, essentially they are strangers... They want to connect heart and body... A storm of forbidden pleasure is about to engulf them.
