When his father remarried to a woman 20 years younger than him, Hiroshi, the only son, ended up living under the same roof with his stepmother, Azumi. Hiroshi is unemployed and has never met a woman, so the tight skin of Azumi , who is only 4 years younger than him, is too much for him to handle... Whether she knows Hiroshi's pure feelings or not, Azumi always Azumi with him, pushing the boundaries. Just when it seemed their relationship would continue, an event occurred that changed their relationship...