The Suffering in the Dark - S1.E4

Ageha suggest to Sarasa the only possible way to Kyushu at that moment; through a secret tunnel. While they were discussing this, Sabo overheards Ageha refers to Sarasa as Tatara and boasted that he knew Tatara in town. That sends the Red Army into Madame Butterfly's camp, where they demand them to hand Tatara over to them until Shidou steps in and stopped them. While Ageha was busy performing on stage, he told Sarasa to leave and with a little help from Madame Butterfly, Sarasa set out to the tunnel. Realizing that something's up, Shidou captured Ageha for questioning.