Chiikawa’s Gekokujo Arc: the online game, Rakko “Sensei,” and Hachiware’s training
Based on our Japanese story page and articles on Rakko and tobatsu; anime episodes checked on the official anime site (2026-10-01).
Chiikawa and Hachiware look up to Rakko, the tobatsu (monster hunting) expert they call “Sensei” (teacher). Aiming for the top ranks of the online game “Gekokujo,” the two soon find Rakko joining the game too, and before long Hachiware begins training for a real tobatsu. Nagano posted it on X from September 2022 to February 2023, with an earlier post from January 2022 as its starting point. Here is where to read it in order, and the anime episodes, without spoilers.
- Original posts
- 30 posts on Nagano’s X: one from Jan 27, 2022, then Sep 7, 2022 – Feb 2, 2023
- Anime
- 10 episodes in three parts (episodes 302–303, 324–329 and 343–344), aired Dec 16, 2025 – May 19, 2026
- Main characters
- Hachiware, Chiikawa and Rakko (Usagi appears too)
- Other names
- Rakko Sensei, “Gekokujo and Sensei,” “Sensei and Tobatsu”
Read the Gekokujo Arc in order
Our Japanese page lines up all 30 of Nagano’s posts for this arc as X embeds, in posting order. The reading page is in Japanese, but you only need to scroll: Nagano’s X posts are lined up from top to bottom in order, and on longer arcs the 「次のページ」 (Next page) button at the bottom takes you on.
- Page 1: The game “Gekokujo” and Sensei(Japanese)
- Posts 1–6
- Page 2: Top rankers and training(Japanese)
- Posts 7–20
- Page 3: Off to a tobatsu with Sensei(Japanese)
- Posts 21–30
- 30 is the number of Nagano’s posts we collected, not an official episode count.
- The first post, from Jan 27, 2022, shows Rakko eating at a standing soba stand, which the two admire; the game story itself starts on Sep 7, 2022.
What is the Gekokujo Arc about? (no spoilers)
Chiikawa and Hachiware set out to become top rankers in the online game “Gekokujo.” Rakko, passing by, tries the game too. Outside it, the two look up to Rakko as “Sensei,” but inside the game their positions are flipped.
- When their game ranking jumps, Rakko offers them training at the celebration. Learning that Chiikawa has the weeding exam coming up, Rakko suggests Chiikawa put the exam first, so Hachiware trains alone. Chiikawa’s exam days continue in the Weeding Exam Arc.
- As the training goes on, Rakko makes Hachiware an offer, and Hachiware, writing down things to do and too nervous to settle, faces the day of going on a tobatsu side by side with Rakko for the first time. That is the climax of this arc.
- We stop there. How that day goes is best found in the comic or the anime.
What do “Gekokujo,” “Sensei” and “tobatsu” mean here?
“Gekokujo” (下克上) is a Japanese word for those below overthrowing those above, and here it is the name of the online game the two play. “Sensei” is what Chiikawa and Hachiware call Rakko.
- Tobatsu (討伐) is one of the jobs Chiikawa and friends do to make a living: fighting dangerous creatures, which pays well because it is risky.
- On the official movie site, Rakko is introduced as the No. 1 ranker in the tobatsu rankings. The game’s ranking and the tobatsu ranking are separate things.
- Rakko’s official name is just “Rakko.” Because “Sensei” appears in the anime titles of this arc, fans also call it “Rakko Sensei.”
Which anime episodes are the Gekokujo Arc?
In the anime it aired in three parts, 10 episodes in all, so the episode numbers skip.
- Episodes 302–303
- “Gekokujo and Sensei 1–2” (下克上と先生)
- Episodes 324–329
- “Gekokujo and Training 1–6” (下克上と特訓)
- Episodes 343–344
- “Sensei and Tobatsu 1–2” (先生と討伐); the second half of episode 344 is a separate short story
- They aired in Japan from Dec 16, 2025 to May 19, 2026, on Fuji TV’s “Mezamashi TV”.
- We have only checked the broadcast in Japan.
Characters and more to read
Hachiware and Rakko carry this story, with Chiikawa close by. Our character pages and other arc guides go further.
Frequently asked questions
Which anime episodes are the Gekokujo Arc?
Episodes 302–303, 324–329 and 343–344, aired in Japan from December 2025 to May 2026.
Why is Rakko called “Sensei”?
Chiikawa and Hachiware look up to Rakko, the tobatsu expert, and call it “Sensei” (teacher). Its name is just “Rakko.”
What is “Gekokujo” in Chiikawa?
It is the online game Chiikawa and Hachiware play, aiming for the top ranks. The word means those below overthrowing those above.
Where can I read the Gekokujo Arc?
The original posts are on Nagano’s X account. Chiifan’s Gekokujo Arc page shows all 30 posts in order.
Sources
Pages marked (Japanese) are only available in Japanese.