Reiko raised her son alone. Now he's a college student and doesn't help with the soba shop at home, just plays around. Seeing Reiko so busy, her son's friend Shiro offered to work part-time, so she decided to have him do it. While secretly superimposing his mother's image onto Reiko, Shiro wants to be of help to her but also harbors twisted desires. After finishing work, Shiro gives Reiko a Mother's Day gift and can't hold back his overflowing lust...
