Oto's Invitation…!! (音の誘い…!!, Oto no Izanai…!!) is chapter 178 of the Naruto manga.
The Sound Four attack Sasuke again, this time having more success. Sasuke still retains the advantage. Meanwhile, Sakura thinks about Sasuke and wonders if it was a good idea to tell Naruto about the cursed seal Sasuke received from Orochimaru, which he had previously instructed her not to. Naruto assured her that Sasuke would never give in to Orochimaru's temptations, putting a smile on her face. Sasuke, however, has been defeated by the Sound Four. They tell him he will never be able to defeat them if he remains in Konoha, as only Orochimaru can give one true power.