S1·E14 Thunder

Baku's new mission is to eliminate his enemy, Nox. Wandering through a black hole in his dream, Baku begins to retrace the nightmare he first saw as a child.

Young Baku attends a cram school. Following his movements, the cram school instructor Nox appears! Shocked by this past encounter with Nox, Baku confronts him, desperate to recover his erased memories!