In the ABO world where the jungle prevails, the Omega Son of Light can only be imprisoned and wait for his fate. However, Cassisi, the second son of the general family who has the military power to manage Xiagu Valley, is an Omega. Cassisi's Alpha brother Bai Gu has loved this younger brother since he was a child, so he underwent a physical examination at the age of 12. He forged Cassie's identity as an Alpha, and took Cassie with him to attend the most elite Alpha military academy in the Light Empire. However, Cassie's growth was accompanied by inevitable periods, and this became a problem. The physical disparity between Cassis and Alpha also became a headache.
Purpose: for love