Seraph of the End, Vol. 27: Vampire Reign (manga)

On the way to Guren’s safehouse to finally get the details on his true plan, Yuichiro drops a bombshell of a question on him: "Did you kill my family?" Guren hesitates to answer, and Yuichiro, wanting a clear response no matter what, challenges him to a fight. As the two battle, Guren comes to realize Yuichiro’s growth, while Yuichiro is reminded of Guren’s strength.