After losing her husband at a young age, mother Chihiro and son Tetsuya have bravely lived together. Tetsuya swore to 'protect his mother' in place of his late father, but this feeling gradually turned into forbidden love... One day, they decided to go on a trip together. Tetsuya's heart raced at the thought of spending time alone with his beloved Chihiro, but he was shocked when she introduced her boyfriend, Toru. Despite Toru's gentlemanly behavior, Tetsuya couldn't bring himself to be honest with him. One day, Tetsuya witnessed Chihiro and Toru entwined...
