When Demon Queen Echidna begins her invasion of the human realm, the people turn to the hero Leo Demonheart to protect them. Blessed with insurmountable power, Leo easily repels Echidna's army, thereby saving the world. But instead of gratitude or admiration, Leo is met with disdain and scorn from his fellow humans, who fear his overwhelming strength and believe that it may eventually cause humanity's demise. Banished from the kingdom he once called home, Leo wanders aimlessly throughout the land until, one day, he hears rumors of Echidna's efforts to rebuild her army. Hoping that demonkind might accept him as an ally, he returns to the demon queen's castle and offers Echidna his help. Naturally, Echidna immediately rejects him. Still, not all hope is lost, as Leo manages to convince Echidna's four generals to let him secretly work under their supervision. Donning the identity of a masked dark knight named Onyx, Leo solves the demon army's problems one by one—gradually improving the quality of life around the castle. Above all else, however, Leo wants to accomplish one goal: to learn why Echidna started the war in the first place.

A two-part new animation released with both Blu-ray/DVD boxes.

Ever since he published a picture that sparked a wave of online harassment, freelance photographer Kouya Madoka has lost everything: his wife Saeko Yukihira, his confidence, and his courage to photograph people. However, years later, a job offer introduces him to the exhilarating world of Formula 4 (F4). A single fierce battle between the amateur drivers in the junior category of open-wheel car racing becomes enough to make Madoka unable to put his camera down. When Komaki Motors' Haruka Asahina bursts into tears on the track, Madoka manages to capture this vulnerable moment. This photo eventually leads Madoka to an impulsive decision: he will help sponsor both the Komaki team and Haruka himself. But the unreasonable costs of the sport quickly cause Madoka to reassess his ambitions, and he seeks different ways to support the severely underfunded F4 team. Despite the uphill battle, Madoka's determination for Haruka to succeed may be the trigger that can propel the young driver straight to the top.