I'm in Hell Naruto: Shippûden : Season 15 Episode 25

Obito is tended to by two Zetsu clones, who help in his rehabilitation, while also telling him about Madara's goal and annoying Obito with potty humor. Obito recovers and gets used to his new artificial body parts, undergoing possible months of training to get used to them. One day, Zetsu arrives with news of Obito's team-mates being in danger, surrounded by Mist ninjas. When Obito fails to break through the rock blocking the exist, the Spiral Zetsu offers himself as an armour for Obito. Obito draws power from the Gedo Statue to break the rock. Madara tells Obito he will properly thank him in the future, and that Obito will come back to him. On his way to the battle site, Obito has a vision of Rin through his empty eye-socket but ignores it. He arrives just in time to realize that Kakashi has run his Chidori through Rin's chest although Rin manages to say Kakashi's name before hitting the ground, dead. As Kakashi studies Rin's body, both he and Obito unknowingly awaken both their Mangekyō Sharingan. Kakashi passes out from exhaustion while Obito, enraged and grief-stricken over witnessing Rin's death proceeds to massacre the Mist ninjas while managing to avoid their attacks. Obito first kills some ninja before slaughtering the rest using Wood Style: Cutting Springs. Having slaughtered the Mist ninja force, standing in a pool of blood and watching Rin's dead body, Obito concludes he is in hell as he mourns the death of the girl he loved.