Kawaki & Himawari Academy Arc

The is the twenty-third arc of the Boruto: Naruto Next Generations anime. It covered episode 261 to 273. It is preceded by the Great Sea Battle of Kirigakure Arc and succeeded by the Labyrinth Game Arc.

Summary
A group of new students enrolls in the Academy; among them are Himawari, Kawaki. Unbeknownst to everyone else, Kawaki is actually not in the academy to become a ninja. Instead he was assigned the mission to supervise Kae Yukiwari, the heir to the crown of the Land of Bamboo. Kae also has not come to the academy to become a ninja, but has been sent to Konoha to be safe from a power struggle. She however has not been told the truth about this.

Hina is a new teacher at the school. She is actually an assassin who planned to kill Kae since she came to the village a decade ago. She tries to kill Kae while undercover as a teacher. Kawaki becomes friends with Kae and works together with Himawari to catch the assassin.

First Hina tries to kill Kae undercover. She finds out Kawaki guards Kae. She tries to get him expelled by giving an anonymous letter to Eiki telling Kawaki is a ninja. When that doesn't work she tries to kill Kae who's in the infirmary when Kawaki is not present, but he gets there in time. In her third attempt she plants paper bombs on the school to distract everyone. Himawari runs away with Kae and once again Kawaki gets in between in time.

In her last attempt Hina takes the kids to an island and takes away Kae as a teacher. But Kawaki finds out she's the assassin and stops her in time to be arrested by the military police with her allies.