| In a world plagued by creatures known as Kaiju, Kafka Hibino aspired to enlist in The Defense Force. He makes a promise to enlist with his childhood friend, Mina Ashiro. Soon, life takes them in separate ways. While employed cleaning up after Kaiju battles, Kafka meets Reno Ichikawa. Reno's determination to join The Defense Force reawakens Kafka's promise to join Mina and protect humanity. |
| Name | Character | Episodes |
|---|---|---|
| Asami Seto | Mina Ashiro (voice) | 12 |
| Shunsuke Takeuchi | Aoi Kaguragi (voice) | 12 |
| Kengo Kawanishi | Soshiro Hoshina (voice) | 12 |
| Makoto Furukawa | Ryo Ikaruga (voice) | 7 |
| Tomokazu Seki | AI (voice) | 6 |
| Mitsuru Miyamoto | Mizoguchi (voice) | 5 |
| Tomokazu Sugita | Takamichi Hotaka (voice) | 3 |
| Megumi Han | Kafka Hibino as a Child (voice) | 3 |
| Tessyo Genda | Isao Shinomiya (voice) | 3 |
| Kenta Miyake | Kaiju No. 10 (voice) | 3 |
| Ryota Suzuki | Akira Kurusu (voice) | 2 |
| Cho | Sebasu (voice) | 2 |
| Koki Uchiyama | Gen Narumi (voice) | 1 |
| Rikiya Koyama | Hoshina's Father (voice) | 1 |
| Shinpachi Tsuji | Head Chef Dojima (voice) | 1 |
| Sachiko Kojima | Girl's Mother (voice) | 1 |
| Mitsuho Kambe | Troops Member (voice) | 1 |