"Take a stand against the face of destruction, brave alchemists!"Once upon a time, the founder of alchemy led people from a dying world to a new land.However, a long time has since passed, and now the world ending "Dust" begins to encroach.
If Golden boy Seiichi experiences failure for the first time at this age, he might not be able to recover. That's when Ryuji makes a suggestion to Risa: "I'll get you pregnant in place of my brother."
Sayuka Koenji, who has the "Doki Doki Dynamo" embedded in her body, has lost her memory... Though his feelings are conflicted, Kyohei Yanase lends her his sexual support and a new relationship begins between the two.