Tokyo in the near future. The rich live in the sky to avoid disasters and epidemics.

NOUNAI Senri joins RUOWA, a large company in the sky, to cure his sister's incurable disease, but his body becomes weak after he takes RUOWA Metal, the company's drink.

At the same time he will have to kill those who suffer from the same side effects to cover up the side effects of the drug!

NOUNAI Senri learns from DATE Shun the last user of the drinking drug RUOWA Metal