“如果当时没有那样做，就一定不会走到如今这步田地！” 每个人都难免曾在人生的某一时刻产生过这样的念头吧，可是世上难买后悔药，人们所做的只能是抛弃过去，直面未来。
本动画围绕着佐藤良太（小林优 配音）和他的小伙伴们，讲述了这8个五年级小学生吵吵闹闹、无忧无虑的日常生活。 良太是个元气十足的男孩子，他爱玩爱闹，最好的朋友是今井浩二和河合翼，良太遇上什么事情都要和浩二分个高下，翼就在一旁充当裁判或和事老。
Jane is a Korean American. She will stay at her father's friend's house for a few months while preparing a chain massage shop in South Korea. However, what she does is not work at a massage parlor, but sells sex toys on internet radio stations. Her boyfriend Tae-in doesn't like what she's doing and tries to make her stop. One day, Jane found out that her mother in the United States was sick. On her way home, Tae-in had a car accident. Jane is accustomed to testing her sex toys on Tae-in, so when he gets sick, her sales will decrease. So she found other men to test her toys...
