Modern manga starts with Osamu Tezuka in postwar Japan. Tezuka, a doctor by training, looked at Disney animation and decided to do something even more ambitious in print: long, novelistic stories told in cheap weekly chapters, drawn for kids and adults at the same time. Astro Boy. Black Jack. Phoenix. He set the template.
Manga is read RIGHT to LEFT. The drawing is in service of the story; pacing is everything. A double-page spread might be one impact moment in a 200-page chapter. The white space is the silence between the music.
Anime took those same storytelling skills into animation. Studio Ghibli (Miyazaki, Takahata) made art films that played as kid movies. Madhouse, Bones, MAPPA, KyoAni today make work as visually serious as anything in Pixar or Disney's catalogue. The line between manga, anime, video games, and Western animation is now mostly fictional.