Boruto and Ohnoki head to the rendezvous point, but they stumble into the Hidden Stone Shinobi Training Grounds, which are protected by a barrier. Ohnoki tells Boruto that the only way out of the Training Grounds is to find his heart of stone, something that can only be found once in a lifetime when a person comes to terms with their will.
That is why I call myself Ku,
as in "empty."
"ولهذا أدعو نفسي "كو"، مِن "فارغ
Denn mein Name bedeutet „Leere“.
Por eso me llamo Kuu o vacío.
Por eso me llamo Kuu, o "vacío".
Per questo mi chiamo Kuu, "vuoto".
Por isso me chamo "Ku",
que significa "vazio".
Ведь имя моё означает пустоту!