Being the third & final Hell Teacher Nube film, it's an okay feature but manages to conclude on a good note. The plot for this film resembles more that of a typical ongoing shonen where our characters are on vacation & danger occurs. In this case, Nube take his student to an island for summer vacation where they encounter a girl named Nagisa who invites them to the sea. Soon afterwards Nube hears of a legend about an aquatic spider residing on the island who feasts on human sacrifices. Comparing the movies, Legend of the Sea seems a bit odd as it takes place in amore rural location & the battle against sea creatures instead of the typical yokai or ghosts. Furthermore, it doesn't really take advantage of its sea setting as not many underwater creatures are featured. It's not a bad film, but doesn't offer much other than the typical comedy found in the series yet doesn't really have that "horror vibe" displayed in the two previous movies. The highlight of this feature is the ending as it portrays Nube once again resorting to a tough life changing decision which adds to his responsibility as an adult & mentor.

Not much action, not much horror, nor that much comedy making this film very optional to watch with its only solace being a few pieces of visuals such as the higher quality opening & the conclusion of the film which delivers those "heart warming moments" found in the anime series.