Unable to contain his anger towards his father for ruining Himawari’s birthday as well as his own, Boruto rushes out to confront Naruto. He runs into Sasuke and unknowingly attacks him but is instantly subdued. Amazed at Sasuke’s strength, Boruto asks him to be his teacher. Sasuke agrees to the request but only after Boruto is able to use the Rasengan. In order to win Sasuke's approval, Boruto trains unusually hard.
It's an A-rank jutsu in difficulty.
إنّها تقنية من الصنف أ في الصعوبة
Das Schwierigkeitslevel dieser Technik
befindet sich auf dem A-Rang.
El nivel de dificultad del Rasengan
es de rango A.
El nivel de dificultad del Rasengan
es de rango A.
Per esemplificarne la difficoltà in termini di rango,
sarebbe una missione di rango A.
É um Jutsu de ranque de dificuldade A.
Если говорить о сложности
изучения, то тут — ранг А.