Hi no Tsugai

The time is the late Heian period. Ruri, a beautiful princess, lives with her kind father and brother, until their peaceful days are shattered by the powerful Heike clan. Ruri escapes from their burning mansion with only her follower Sanmori, but they are confronted by a man with crimson eyes…!? Forced into a pact, will it be a blessing or a curse? (Source: Flower Comics, translated)