This is the OVA that figured out the assignment early: put six episodes of gorgeous fallen-angel melodrama on screen and let the longing do the heavy lifting. The plot says the seal on Kirin no Yuda and Houou no Ruka has broken and guardian angels are vanishing from Earth, but you and everyone else know the real engine is what Yuda and Ruka still feel about the Heaven that threw them out, and what the four Saint Beasts feel about each other while investigating it. It is not built for spectacle. It is built for candlelit two-shots, hands that linger, and conversations that stop one word short of confession. Yes, the scripting is forced and the plot bends itself into pretzels to trap two beautiful men alone in a room, and if that sentence sounds like a warning to you, this was never your show. For everyone else, 2003 shounen-ai rarely looked this good on purpose.
A mystical seal fractures in Heaven, releasing two fallen angels consumed by centuries of rage. Kirin no Yuda and Houou no Ruka orchestrate their return to power by systematically erasing the guardian angels who protect Earth, leaving Heaven scrambling to understand the crisis unfolding in the mortal realm. When divine protectors begin vanishing without explanation, suspicion falls on something far older and more primal: an ancient animal spirit fueled by vengeance. Heaven dispatches the Saint Beasts, four legendary celestial guardians bound to investigate the disappearances and confront whatever darkness threatens the cosmic balance. What unfolds is a race against time as these mythical protectors chase down both the missing angels and the source of the disturbance. The Saint Beasts must decode the connection between the disappeared guardians and the vengeful force orchestrating their capture, all while preventing a full assault on Heaven itself. This is action-driven supernatural fantasy that blends celestial warfare with the primal power of mythological beasts. Sharp combat sequences collide with mounting dread as the scale of the threat becomes clear.