Hitori No Shita - The Outcast S02 E07 36 Rebels

When Soran is shocked to learn from Elder Shinchuu that his grandfather Chou Kaigi was a member of Zensei, the Tenshi and Rikukin explain what happened to him. On their way back, Soran is invited to a party by Rikukin's granddaughter Riku Rinron