A manga and an anime called Basilisk (2005) are based on the same novel The Kouga Ninja Scrolls and bear the same character names as in the novel and the movie. Although their characters in the film are highly altered from both the original novel and the manga/anime series.
The film characters with superhuman powers are considered to be Japanese X-Men due to being outcasts and being born with their own abilities, it is worth noting however that one of the film's inspirations was the novel The Kouga Ninja Scrolls published in 1959 while the first issue of X-Men was released in 1963.
The story is an adaptation of Futaro Yamada's novel The Kouga Ninja Scrolls, which depicts the clash between two ninja clans, Iga and Kouga, and the fated love between Gennosuke (Kouga) and Oboro (Iga).
The trivia item below may give away important plot points.
Oboro pokes her eyes out to prove how far she is willing to go to save the villages from destruction. However, in the ending her eyes look perfectly normal and undamaged and we seemingly view two shots from her perspective which would not be possible if she were blind. It is possible that she did not poke her eyes out but just damaged them allowing them to heal, we can also see that her eyes are not focused on anything and she is just looking around aimlessly which would mean she is probably still blind. It is also worth noting that in a universe where Shinobi are born with superhuman abilities it is not too unbelievable that her eyes recovered and she still has her abilities, the ending is intentionally ambiguous in this matter.