A senior combatant of East Central SEPB branch. His bug is a giant Japanese horned beetle that has impressive defense, the bug's massive size also allows it to easily blow away smaller bugs, but otherwise it does not have any special power.

Yamato does not show much emotions and is usually remains calm about current situation. Although not being a high rank member (rank 6), he has a high mission sucessful rate and manages to survive in many big battles (including one against "Fuyuhotaru").