剧情：
了平這次被教練命令道空手道部去接受跨社團鍛煉。

了平的鍛煉就是被綁在沙包上，然後被空手道部的成員當成人肉沙包，輪流被團員們拳擊自己身體5分鐘來鍛煉身體的耐力。

然而了平在第8位團員的拳擊下忍不住疼痛暈了過去。教練看到了非常生氣的把了平拍醒，然後拿起鞭子當場用力的抽打了平的身體作為懲罰！

傷痕累累的了平在被抽完后繼續鍛煉知道所有的團員都對了平做出拳擊為止....
Story：

Sasagawa Ryohei is being order by his coach to having a cross practice activity at Karate club.

But the practice for Ryohei is being bind on the sandbag and become the "human sandbag" for all the karate members. All the Karate members are allow to punch Ryohei for 5 minutes in order to train the stamina of Ryohei.

During the 8th person, Ryohei can take it anymore all fainted. His coach was very angry, he wake Ryohei up and whip Ryohei hardly on the spot!

After the whipping, Ryohei continue his practice until all the Karate member done a punch on him.....