Chained Soldier manga volume 7 features story by Takahiro and art by Yohei Takemura.

A horde of Shuuki attacks the commander’s assembly, and the overwhelming power of Ren Yamashiro, the supreme commander, is finally revealed!! Yuuki can hardly hide his surprise at her strength, but it seems she’s taken a strange interest in him. What’s more, the Demon Defense Force holds a joint training session to prepare for the battle against the Eight Thunder Gods, and it seems that Yuuki will be lent out to a new master…?!