Ragna Crimson

In a world where dragons (ancient, fearsome creatures) are considered humanity's greatest adversaries, two ways exist to bring them down: freezing their blood with silverine, a rare aura granted by silver-infused weapons, or incinerating their bodies with the intense power of sunlight. Leonica, a gifted young hunter, is skilled beyond her years, her strength and prowess unmatched. By her side is Ragna, a seemingly unremarkable companion who struggles to prove his worth. Often mocked by others, Ragna is branded as cursed, for dragons seem drawn to him, slaughtering those close to him in their wake. Yet Leonica sees something in him—potential that others overlook—and she chooses to partner with him on her dangerous hunts. Ragna, deeply aware of his own lack of talent, places his trust in Leonica's abilities, convinced that she is immune to the misfortune that plagues him. But his world is shaken when he dreams of Leonica's death. Haunted by the dream, he fears it is a prophecy he must prevent. As the fated day approaches, Ragna encounters a mysterious figure from his future—his future self. This enigmatic version of Ragna grants him immense power and the memories of what is to come, preparing him to protect Leonica at any cost. To fulfill his mission and avert the prophecy, Ragna must seek the aid of a shadowy figure known only as Crimson. Together, they will fight to rid the world of dragons once and for all, facing impossible odds and unraveling a dark history that binds their fates. The journey ahead will challenge Ragna's beliefs, his strength, and ultimately, his loyalty to those he holds dear.

Ragna (ラグナ, Raguna) Voiced by: Chiaki Kobayashi, Nobutoshi Canna (future) (Japanese); Jack Stansbury, Ty Mahany (future), Chelsea McCurdy (young) (English) Crimson (クリムゾン, Kurimuzon) Voiced by: Ayumu Murase (Japanese); Jade Kelly (English) Leonica (レオニカ, Reonika) Voiced by: Inori Minase (Japanese); Cat Thomas (English) Ultimatia (アルテマティア, Arutematia) Voiced by: Reina Ueda (Japanese); Juliet Simmons (English) Grymwelte (グリュムウェルテ, Guryumuwerute) Voiced by: Takehito Koyasu (Japanese); Matthew David Rudd (English) Disas Trois (ディザストロワ, Dizasu Torowa) Voiced by: Shunsuke Takeuchi (Japanese); Alan Brinks (English) Temruogtaf (メルグブデ, Merugubude) Voiced by: Kōzō Shioya (Japanese); Rob Mungle (English) Michael (ミハイル, Mihairu) Voiced by: Yoshihito Sasaki (Japanese); Joe Daniels (English) King Femud (フェムド王, Femudo Ō) Voiced by: Takashi Matsuyama (Japanese); Josh Morrison (English) Woltekamui (ウォルテカムイ, Worutekamui) Voiced by: Junichi Suwabe, Mutsumi Tamura (young) (Japanese); Jeremy Gee, Chelsea McCurdyEp. 23 credits (young) (English) Slime (スライム, Suraimu) Voiced by: Fairouz Ai (Japanese); Margaret McDonald (English) Chimera (キメラ, Kimera) Voiced by: Mamiko Noto (Japanese); Annie Wild (English) Golem (ゴーレム, Gōremu) Voiced by: Hiroki Tōchi (Japanese); Gabriel Regojo, Sean Patrick Judge (Rowan) (English) Staria Reze (スターリア・レーゼ, Sutāria Rēze) Voiced by: Rina Hidaka (Japanese); Donna Bella Litton (English) Hazella (へゼラ, Hezera) and Greya (グレア, Gurea) Voiced by: Rio Tsuchiya (Japanese); Karlii Hoch (Hazella), Natalie Rial (Greya) (English) Nebulim (ネビュリム, Nebyurimu) Voiced by: Daiki Yamashita (Japanese); Chaney Moore, Antonio Lasanta (matured) (English) Taratectora (タラテクトラ, Taratekutora) Voiced by: Ryōta Takeuchi (Japanese); Daman Mills (English) Olto Zora (オルト・ゾラ, Oruto Zora) Voiced by: Ryōtarō Okiayu (Japanese); Nathan Wilson (English) Borgius (ボルギウス, Borugiusu) Voiced by: Kenyu Horiuchi, Katsuyuki Konishi (de-aged) (Japanese); James Belcher, David MatrangaEp. 19 credits (de-aged) (English) Dornea (ドルニーア, Dorunīa) Voiced by: Keisuke Komoto (Japanese); Alejandro Saab (English) Baron Sierra (バロム・シェエラ, Baromu Sheera) Voiced by: Takuya Satō (Japanese); Ian Sinclair (English) Chantioras (シャンティオラス, Shantiorasu) Voiced by: Takuya Eguchi (Japanese); Scott Gibbs (English) Isaac Stern (アイザック・スターン, Aizakku Sutān) Voiced by: Tomoaki Maeno (Japanese); Benjamin McLaughlin (English) Christopher Algren (クリストファー・オルグレン, Kurisutofā Oruguren) Voiced by: Kenji Hamada, Mari Hino (young) (Japanese); Kregg Dailey, Annie WildEp. 22 credits (young) (English) Shin Cutlass (シン・カトラス, Shin Katorasu) Voiced by: Tasuku Hatanaka (Japanese); Greg Cote (English) Fu (フー, Fū) Voiced by: Yukihiro Nozuyama (Japanese); James Marler (English) Garm Ulban (ガルム・ウルバン, Garumu Uruban) Voiced by: Shirō Saitō (Japanese); Jay Hickman (English) Nazarena Teluzian (ナサレナ・テルジアン, Nasarena Terujian) Voiced by: Yū Shimamura (Japanese); Rachael Messer (English) Majorca Abbott (マジョルカ・アボット, Majoruka Abotto) Voiced by: Marika Kōno (Japanese); Savanna Menzel (English)

Written and illustrated by Daiki Kobayashi, Ragna Crimson started in Square Enix's shōnen manga magazine Monthly Gangan Joker on March 22, 2017. Square Enix has collected its chapters into individual tankōbon volumes. The first volume was released on October 21, 2017. As of May 21, 2026, 17 volumes have been released. In North America, the series is licensed for English release by Square Enix Manga & Books imprint.

An anime television series adaptation was announced on March 19, 2022. It is produced by Silver Link and directed by Ken Takahashi, with scripts written by Deko Akao, character designs handled by Shinpei Aoki, and music composed by Kōji Fujimoto and Osamu Sasaki. The two consecutive-cour series aired from October 1, 2023, to March 31, 2024, on Tokyo MX and other networks. The first opening theme song is "Roar", Ulma Sound Junction, while the first ending theme is "Rinkaku" (鱗角), performed by Watashi Kobayashi. The second opening theme song is "Kannōsei Liberation" (感脳性リベレーション; lit. 'Cerebral Liberation'), performed by saji, and the second ending theme song is "Sora ni Shimeyū" (空に標結う), performed again by Kobayashi. At Anime Expo 2022, Sentai Filmworks announced that it had licensed the series outside of Asia. Muse Communication has licensed the series for South Asia and Southeast Asia. It premiered on Animax Asia on December 24, 2024.