The TV anime Katainaka no Ossan, Kensei ni Naru (Season 1, 12 episodes), based on the popular light novel by Sagasaki Shigeru (illustrated by Nabeshima Tetsuhiro, published by Square Enix), is currently available for unlimited streaming on multiple services in Japan. Here is a full breakdown of where to watch it, with pricing and free-trial information current as of July 2026.

Top Recommended Streaming Services

• DMM TV — ¥550/month (tax incl.) | 14-day free trial | 550 bonus points on sign-up
• U-NEXT — ¥2,189/month (tax incl.) | 31-day free trial | 600 bonus points on sign-up
• d Anime Store — ¥660/month (tax incl.) | First month free (31 days) | Anime-focused service

The series is also available on Amazon Prime Video and Hulu. It is not currently available on Netflix or Disney+.

Full Service Comparison (as of July 2026)

• DMM TV — Unlimited / ¥550/mo / 14-day free trial + 550 pts
• U-NEXT — Unlimited / ¥2,189/mo / 31-day free trial + 600 pts
• d Anime Store — Unlimited / ¥660/mo / First month free (31 days)
• Amazon Prime Video — Unlimited / ¥600/mo / 30-day free trial
• Hulu — Unlimited / ¥1,026/mo / No free trial
• FOD — Unlimited / from ¥976/mo / No free trial
• TELASA — Unlimited / ¥990/mo / No free trial
• TVer — Free (select episodes)
• YouTube — Free (select episodes)

All prices include tax. Availability may change; always verify on each service’s official site or app.

Story Synopsis

Beryl Gardenant is a swordsmanship instructor running a small dojo in a rural village. He genuinely believes himself to be an ordinary, unremarkable swordsman — yet everyone around him recognises his skill as extraordinary. When his former student Alyusha Citrus, now commander of the kingdom’s knight order, insists he come to the capital as a special instructor, Beryl is thrust into an unfamiliar city life. Oblivious to his own overwhelming ability, he navigates one surprising situation after another.

Highlights

• Unaware overpowered protagonist — Beryl’s casual display of jaw-dropping swordsmanship, while remaining completely clueless about it, is the show’s central charm.
• Warm mentor-student bonds — The affectionate relationships between Beryl and his accomplished former students add genuine emotional depth.
• Talented cast and dynamic sword action — Directed by Kazumi Rosei and produced by Passione × Hayabusa Film, the fight choreography is a visual standout.

Main Cast

• Beryl Gardenant — Hirata Hiroaki
• Alyusha Citrus — Higashiyama Nao
• Srena Risandera — Ueda Hitomi
• Kuruni Cruciel — Hirose Yuki
• Fissel Harbeler — Yano Hinaki
• Myui Freia — Nakata Arisa
• Rose Marbleheart — Kayano Ai
• Lucy Diamond — Saito Chiwa
• Hembriz Draut — Ishikawa Kaito
• Spurl — Osaka Ryota
• Gatoga Razuon — Kiuchi Hidenobu

Production Information

• Title: Katainaka no Ossan, Kensei ni Naru
• Original Work: Light novel by Sagasaki Shigeru (story) & Nabeshima Tetsuhiro (art) / Square Enix
• Director: Kazumi Rosei
• Series Composition: Okada Kunihiko
• Animation Studio: Passione × Hayabusa Film
• Broadcast Run: April 5 – June 2025 (12 episodes) on TV Asahi network (IMAnimation slot), BS Asahi, and AT-X
• Genre: Anime / Fantasy

FAQ

Where can I watch Katainaka no Ossan, Kensei ni Naru?

On DMM TV, U-NEXT, d Anime Store, Amazon Prime Video, Hulu, and more. DMM TV offers the best introductory deal with a 14-day free trial and 550 bonus points.

Is it on Netflix?

No. As of July 2026, the series is not available on Netflix.

How many episodes are there?

Season 1 consists of 12 episodes, which aired from April to June 2025.

Where can I watch Season 2?

Katainaka no Ossan, Kensei ni Naru II began broadcasting on July 8, 2026. Amazon Prime Video holds the worldwide exclusive streaming rights, with new episodes available from July 9, 2026 at 00:15.