Yakumo's Sealed Ability Naruto : Season 4 Episode 204

Naruto sneaks into Yakumo's mansion in the night, and has a dream that Kurenai threatened to seal Yakumo's abilities. He then discovers that this is the reason why she left the team, but Kurenai refuses to disclose any more. As Kurenai goes to see Yakumo, several Kurama Clan members attack.