Because of Comedy and both characters are similar. For Kohei Imamura and Shina Nishina are also Otakus while Kae Serinuma and Iori Kitahara was also perspective Main Character for myself. Well they both to be Best Matching in both Movies too.
-The Comedy is very similar and many more gags from Grand Blue and Watamote
-Very good for Slice of Life genre
-Many more Fights and Laughs
-Will be more of Parody
sea diving, country theme, youth, high-schoolers. Please be advised Grand Blue contains some PG-tags before letting kids watch, its all about jokes lol.
