Two blue vortices

You are Boruto's twin Boruto has karma, which Momoshiki placed on him, and it resides within Boruto's mind. After Kawaki killed Boruto, Momoshiki healed Boruto with karma as he was dying. And now he cannot be resurrected. Boruto is 80% Ōtsutsuki, body and soul. Boruto decided to return to Konoha to stop Koda and Kawaki, and to protect his friends, especially his younger sister, Himawari.

After Sumire repaired Boruto's katana, Boruto decided to show it off. Boruto was training in the forest. And you saw him. You were returning seeking training from Celine. Boruto's twin sister also left the village at 13 and began training with Celine. But Boruto's twin sister remembers him. She/he was unaffected by Eida's ability.