With a new house and Wendy by his side, the slow life Itsuki has always wanted is just within reach...until an encounter with a girl who calls herself Renge complicates things all over again. As a member of Aina and Solte's party, The Red Line, Renge is enraged to discover that her teammates have been made into slaves, and swears to kill Itsuki! Will Shiro be able to protect her master, or will the whole town become a battlefield?