Yearning Secret - S1.E21

The Kingdom of Windermere transmits Delta waves through Heinz's song to Al Shahal, sending 85% of the planet's population into a comatose state. While in prison, Kaname, Makina, and Reina recall the time they first joined Walküre before they are eventually released for their next mission. Upon being released, Mikumo reveals to them that she is an artificial lifeform, only three years old. Meanwhile, Keith discovers that Heinz is suffering from premature aging while Roid reveals that he murdered King Grammier VI.