The Ketsuryūgan

Determined to pry the truth out of Fūshin, Sasuke presses forward while his opponent whips up an escalating gale that swells from windstorm to typhoon. Only the Complete Body-Susanoo lets Sasuke shear through the wind, and when Fūshin conjures something fiercer, he drops the technique and slips into the calm eye to land a Chidori. His Sharingan tries to read Fūshin's memories but slams into the resistance of the Ketsuryūgan, and it takes the Mangekyō to shake loose. By then Fūshin has vanished.

Reaching the Valley of Hell, Sasuke wonders aloud whether the Chinoike clan ever settled there, and Chino steps out to confirm it. She recounts the misery of that exile and the isolation that had swallowed her before En Oyashiro seized her, a loneliness that stirs Sasuke's own memories of Naruto. Drawn to her story, he lets her show him her past through the eye itself.

Forced into shinobi life by Oyashiro after her Ketsuryūgan woke, Chino was made to fight in the Coliseum, where beating Fūshin bound him to her master. The two became friends, later uncovering records of her clan and gathering others who wished to flee. As the Lightning Group, they defended struggling villages, drew Kirigakure's employment, then found themselves marked for disposal. Denied refuge everywhere, their number dwindled until only Chino and Fūshin remained to reach the valley, where nothing revived her memories. Attacked by Kiri shinobi, she detonates one with her bloodline and swears to avenge her people.

Sasuke overpowers Fūshin with the Complete Body-Susanoo and a well-timed Chidori, then breaks the Ketsuryūgan's block on his Sharingan using the Mangekyō. In the Valley of Hell, Chino reveals herself and relives her origin: awakening the bloodline, surviving the Coliseum, forging the Lightning Group with Fūshin, and being cast aside by Kirigakure. The episode closes on her vow of revenge for the Chinoike clan.

This is the four-hundred-eighty-seventh Naruto: Shippūden installment, part of the Sasuke Shinden: Book of Sunrise arc. It first aired in Japan on December 22, 2016, with an English broadcast on June 11, 2019. The opening theme is Empty Heart and the ending is Departure Song. Chino's account of her loneliness deliberately mirrors the bond between Sasuke and Naruto.