The movie Shinobi: Heart Under Blade is a live-action adaptation of the popular manga and anime series Basilisk. It is set during the feudal era of Japan and follows the story of two ninja clans - the Iga Clan and the Koga Clan. These clans have been at war with each other for centuries and have been tasked with protecting their respective lords.
Gennosuke and Oboro are the offspring of the two clans' leaders and have grown up hating each other. However, they both harbor feelings for each other that they keep hidden from their families.
The annual conference with the Lord brings the two clans together to choose the five best shinobi from each village to compete against each other. The winner of this competition will receive both the Lord's favor and the right to rule over both clans.
Gennosuke and Oboro are both chosen as the leaders of their respective clans, putting their love and loyalty to the test. They must now lead their ninja teams into battle against each other, knowing that they may have to face each other in a fight to the death.
The other members of the clans are also introduced, each with their unique ninja abilities and personalities. The competition becomes more intense as the battles become more deadly and dangerous.
As the competition progresses, Gennosuke and Oboro's love for each other becomes more evident, and they begin to question the true meaning of the feud between their clans.
The movie culminates in a final battle between Gennosuke and Oboro, with the fate of both clans hanging in the balance. The ending leaves the viewer with a sense of tragedy, as the love story is overshadowed by the violence and hatred between the two clans.
