Bushy Brow's Pledge: Undying Love and Protection!

is episode 31 of the original Naruto anime.

Synopsis
Rock Lee leaps through the trees alone trying to find the other scroll his team needs, while hiding under a tree Sakura tends to Sasuke's and Naruto's wound while trying to stay awake. She then dreams of the two waking up and Orochimaru turning into a giant snake and eating the two of them, when she wakes she hears something rustling in the bushes. A squirrel comes out but Sakura throws a kunai towards it and sends it away, while Dosu, Kin, and Zaku wonder if she saw the exploding tag that they put on the squirrel's back, they then get ready to attack.

While Rock Lee stops on a branch some leaves begin to fall and he says to himself that if he can catch all 20 leaves before they hit the ground then Sakura will fall in love with him. After catching 19 of the 20 leaves he sees a squirrel with a exploding tag on it's back and saves it destroying the exploding tag, but letting the last leave hit the ground. Neji ends up finding Ino, Shikamaru, and Choji hiding behind some bushes, and so they went to plan 2, in which Ino tried her hardest to seduce Neji but failed and he left without taking their scroll. Dosu and his squad challenge Sasuke, but she defends them and sets off two traps for them, the first one they saw through, but the second one they didn't see coming.

Unfortunately Dosu managed to destroy the trap with ease and shortly after made a remark about how Sakura had no right to be a ninja and just before they could land their attack, Rock Lee showed up and knocked the three of them away. Sakura wonders why Rock Lee was there, to which he stated that he would protect her until his death. Dosu tries to attack Rock Lee, but Lee manages to pull up a root and blocks it, while Ino and Shikamaru wonder about if they are anyone weaker than them when Choji spots Sakura fighting. Rock Lee remembers back to when he learned the Front Lotus and how when he finally mastered it that his sensei Might Guy to him it was forbidden. Guy explained that that jutsu puts tremendous strain on a persons' muscle, and that it brings power that over exceeds the limit's a person's body can take and can only be used to protect the life of someone precious.

Lee then unwraps some of his arm bandages and attacks Dosu, but Zaku managed to help him out and Lee's body was still not recovered from the jutsu.