Based on the light novel series by Shoji Gatoh, this fourth installment to the anime series continues Mithril’s mission to protect Kaname Chidori, a high school girl who is the target of many interested parties due to her hidden abilities that could change the course of the future. Assigned to protect Chidori is Sousuke Sagara, a teenage soldier who is very good at his job but knows nothing of being a normal teenager.

In this latest edition to one of mech’s hottest franchises, we have Delta. Mixing mechs with singing, the forces of the UN Space Force must face forces of the planet Windermere, who use a virus to attack innocent civilians. The only ones capable of suppressing the virus is Walkure, a commando idol unit who use their singing talents to calm the symptoms. Backing up the Walkure unit is the Delta Squadron whose latest recruit, Hayato, has a connection as to why they Windermerians are waging war.