Takahiro Sakurai's Diablo Gets a Solo Mission
Episode 14 of Season 4, which doubles as Episode 86 of the TV anime overall, steps away from Rimuru entirely. According to a preview from Japanese entertainment news site Dengeki Online, Diablo has left his master's side and traveled to the demon world, where he calls on three demons he has known for a long time. His goal is practical: he wants to hand them the miscellaneous work piling up in Tempest, the monster nation Rimuru leads.
The preview stops there. It does not name the three demons, and the accompanying stills are the only other hint at who Diablo is visiting. Longtime light novel readers will have their guesses, but the anime is keeping the reveal for the broadcast.
Diablo is voiced by Takahiro Sakurai (Giyu Tomioka in Demon Slayer, Reigen in Mob Psycho 100), and an episode built around his character is a rarity. Since his summoning, the demon has mostly operated at Rimuru's elbow, so a trip back to his home turf is new territory for the anime. On the production side, Akiko Waba wrote the episode's script, with storyboards and episode direction by Mai Suzuki.
Where Season 4's Second Cour Stands
Season 4 is a split five-cour project, and it opened with two cours airing back to back. The first began on April 3, 2026, in Nippon TV's FRIDAY ANIME NIGHT block, which runs Fridays at 11:00 p.m. JST across a 30-station network, with BS11 airings following Saturdays at 10:00 p.m. The second cour started on July 3, 2026, and Episode 14 is next up in that Friday slot. Eight Bit remains the animation studio.
Story-wise, this season picks up after Tempest's Founding Festival. The official introduction describes a nation building diplomatic ties and working toward a world where humans and monsters live side by side. Standing against that vision are Granville Rozzo, a former hero who heads the Kingdom of Siltrozzo's Five Elders, and his granddaughter Maribel, who see Rimuru's rise as a threat and believe humanity should be protected through control. Meanwhile, demon lord Leon is moving toward his own goal in the golden land of El Dorado, and the introduction teases that another hero is about to awaken.
Against that backdrop of scheming nations and stirring heroes, an episode about Diablo delegating Tempest's chores reads like table-setting, and the title "Black Corps" suggests the errand is bigger than it sounds. What actually comes of the meeting, we'll find out when the episode airs.
Looking Ahead
Internationally, Crunchyroll streams Season 4 with new episodes arriving Fridays at 7:00 a.m. PT, available subbed and with an English dub. The current two-cour block covers 24 episodes running from April through September 2026, with the remaining three cours of the season still to be scheduled. The latest official trailer, PV No. 2, is up on the series' YouTube channel.
The source manga by Taiki Kawakami, based on Fuse's novels with character designs by Mitz Vah, is serialized in Kodansha's Monthly Shonen Sirius magazine and published in English by Kodansha.