In Japan, most manga are divided into categories by gender and age group: boys (shonen), girls (shojo), women (josei), and men (seinen). But the readership is more fluid than those strict labels ...

While seinen anime comes alongside its own set of genre ... The story follows Manji, an immortal samurai who helps a young woman avenge the death of her parents. Written by Gamon Sakurai, Ajin ...

On the other hand, some seinen anime, though targeted toward a mature audience, retain an adventurous lightness or direct action that places them, at heart, more into the category of shonen.