Boruto episode 10 aired this week and featured the beginning of the ghost investigation. While Boruto and his friends conducted their own investigation, Naruto orders for a separate investigation to be carried out by Sai. Now the details of the upcoming episodes reveals lots of information along with a hint to what Boruto’s summoning might have been.
The information can be seen below:
Looking at this information, we find out that episode 13 will feature a beast called “Nue”. With a quick note from Ken Xyro we get an explaination of what this beast is like. Furthermore, if we look on google for images of this beast, we can see him being very similar to the shadow of the beast that appeared when Boruto used his summoning.