To kick off the season, a special episode titled "Digression: Diablo's Journal" will release on March 30, recapping the events of Season 2 from Diablo's perspective.

Following the faceless god Hitogami's advice seems to have worked wonders for Rudeus Greyrat. After enrolling into the University of Magic as he was told, Rudeus reunites with his childhood friend Sylphiette, who put a valiant effort into curing his condition. The two grow ever closer together and decide to host a wedding party, inviting the friends they have made over the years to announce and formalize their relationship. For all his recent blessings, however, Rudeus' troubles are far from over. The research he is helping Shizuka Nanahoshi conduct hits a bottleneck, sending her into a deep slump much like he experienced in his previous life. Furthermore, a letter from his father, Paul, brings complications to Rudeus' relationships, and Sylphiette still knows next to nothing about his real background. In the face of these issues, Rudeus will have to apply the lessons he has learned in this new world to navigate through the challenges that come with living a life to its fullest.

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After the destruction of their hometown, childhood friends Kafka Hibino and Mina Ashiro make a pact to become officers in the Defense Force—a militarized organization tasked with protecting Japan from colossal monsters known as "kaijuu." Decades later, the 32-year-old Kafka has all but given up on his dreams of heroism. Instead, he cleans up the remains of the slaughtered kaijuu after they are defeated by valiant soldiers—including Mina, who has successfully achieved their shared goal. Upon meeting his new coworker, Reno Ichikawa, Kafka faces a mirror of his past self: an ambitious young man whose one desire is to fight as a member of the Defense Force. Unfortunately, the two are soon involved in a freak encounter with a rogue kaijuu. Though Kafka demonstrates his innate heroic nature and rescues Reno from certain doom, he is left gravely injured. While both men recover in a hospital, Kafka is seemingly attacked by another one of the beasts. As a result, he gains the ability to transform into a humanoid kaijuu with the strength and powers of the massive monsters menacing Japan. Dubbed "Kaijuu No. 8" by the military, Kafka resolves to use his newfound gifts for the greater good. Tied together by mutual respect, Kafka and Reno set out to join warriors like Mina at the forefront of the Defense Force.