Once the greatest hitman of all, Taro Sakamoto retired in the name of love. But when his past catches up, he must fight to protect his beloved family.

After learning heretical teachings about the Earth and the Sun, a child prodigy searches for his master's hidden research while evading the Inquisition.

When sinister forces threaten the peace of Britannia, a young prince embarks on a perilous journey to save his loved ones and discover his true powers.