A beautiful mother, Miyabi, lives with her son, Satoshi. Although she is happy every day, she feels lonely because she has not seen her husband who is away for a long time on an overseas assignment. One day, when her son's best friend, Yuu, who was an old friend of hers, visited her house to observe the stars, she suddenly confessed to him and received a kiss from him. Miyabi felt her heart pounding uncontrollably, contrary to her own wishes. After that,