A beautiful mother, Miyabi, lives with her son, Satoshi. Although she is happy every day, she feels lonely because she has not been able to see her husband for a long time as he is away on assignment overseas. One day, when Yuu, her son's best friend and 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 in her chest, despite her will. After that,