Maito Gai use the sword which rob from Hoshigaki Kisame to cut Hoshigaki Kisame, but he is hurted by that sword. Because the sword is only used by Hoshigaki Kisame. In order save his student, Maito Gai have to fetch nunchakus.

Meanwhile Naruto realize that he get a magic, he remembers Jiraiya already told him how to break magic. Then he uses this method cure it.

Tenten is in danger, but Maito cannot save her. At this time, Hoshigaki Kisame hit Maito Gai into lake. In lake, Hoshigaki Kisame send his water monster to eat Maito Gai. Maito Gai  use his  energy burn the water in lake. Hyuga Neiji utilizes the chance saving Tenten.

http://www.animegirlmovie.com