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"21 g" is said to be the weight of the human soul.
After completing Tenju, the body after the soul has gone out is said to be lighter by 21 g than it was before living.
It is only 21 g of soul, but if you live a life full of eyes and train your soul, perhaps the quantity may increase.
It is a band where four people gathered to burn the hot soul as if it is going to live as long as it aims at a soul of 21 g or more.
21g / サイコパス