Daishiba (大司馬) is the Chief Minister of the Ministry of Summer, which is charged with matters relating to military affairs and the Royal Army. The daishiba holds the rank of Keihaku. The minister serves directly under the kingdom's ruler as the kingdom's Grand Master of Cavalry.
- Mousen - A lesser guard for the King of En, promoted to the rank of Daishiba for Shoryu to take control of the Royal Armies in opposition to his advisors and end the rebellion in Gen Province
- Seishou - A general in Royal Army of En, initially appointed to be the daiboku (the personal bodyguard) of Shoryu. He is later promoted to the rank of daishiba several years after the rebellion in Gen Province