Chained Soldier manga volume 5 features story by Takahiro and art by Yohei Takemura.

The 6th and 7th Squads team up to rescue the abducted Yuuki, kidnapped by a humanoid Shuuki…who turns out to be his long-lost sister Aoba. Upon learning about their situation, Yuuki tries to convince his sister to let go of her hostility toward the Demon Defense Force, but their conflicting ideals lead to a fierce battle between the two siblings!

Chained Soldier manga volume 6 features story by Takahiro and art by Yohei Takemura.

Tenka falls after a fierce duel with Aoba, but with the arrival of backup from the 6th and 7th squads, the battle is drawing to a close—that is, until a new force of humanoid Shuuki calling themselves the Eight Thunder Gods join the fray! Unaffiliated with Aoba’s group and boasting overwhelming power, what could these mysterious figures be after…?!

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…?!

Chained Soldier manga volume 8 features story by Takahiro and art by Yohei Takemura.

Having been lent to Supreme Commander Yamashiro, Yuuki goes berserk in an overwhelmingly powerful new form—one too strong for his body to handle. Meanwhile, the Azuma Family is preparing to decide their next leader. Desperate to prove herself to both her mother and her relatives, Himari resolves to participate, plunging her and Yuuki into a vicious free-for-all battle with their pride on the line!