Tenrou: Sirius the Jaeger — Season 1

Full moon shines through the quiet night of Shanghai. A young man walks alone, as if weaving the light. Reunited and forming a pack, they head out for a suspicious-looking mansion. In there, a banquet is held by vampires. They call themselves the "Jaegers" who breaks in and hunt vampires down. As the Jaegers head out to Japan, they use V shipping company as their alias in order to spy on the vampires in secret. Just as they arrive, atrocious crimes begin to happen. When all the dots are connected to form one line, Sirius bares its fang.

Scientist named Hanada rescues wounded Yuliy. He is to take a rest at Hanada's manor until he recovers. Yuliy finds temporal peace as he spends time with Hanada's daughter, Saki. However, it does not last long. A herd of vampire storms into the manor. They are after Hanada's artificial heart. As vampire cold-heartedly tear away the family bond, jaegers rise.

After the incident with Dr. Hanada and Saki, Yuliy begins to remember the days he spent in his home village; Dog-Ville. He lived with his family peacefully, however, vampires attack the village to obtain the Arc of Sirius. With his mother murdered, Yuliy runs away with his brother in desparation. He survives at the cost of his brother's sacrifice. And now, he is torn by the fact his brother, Mikhail has turned into a vampire. Can he really point his fang against him?

There will be a military excercise in Shizuoka by Alma trading company to test out the new weapon. With that information, Yuliy and Dorothea get on the train. Official reason is to hunt down the vampires but secretly hoping to see his brother again. Yuliy smells blood and .

Yuliy finally meets Mikhail, a brother whom he thought was dead. As Mikhail is now a vampire, he becomes speechless to their bloody fate. Meanwhile, Hyakko party attacks the same train in retaiiation against Alma Trading Company who cut them off financially. Jaegers, Iba and Ryoko rises. Yuliy also runs up the train as to shake off Mikhail's words but his path is blocked by artificial humanoid weapon created by Klarwein.

"Arc of Sirius" - a mysterious word Mikhail left. Yuliy is also confused as Willard hints that revenge is not the only path for him if the arc can be used. However, vampires were already on the move. Jaegers are forced to fight back as they reach Naoe family house. During deadly battle, Yuliy's feeling waiver as he recalls earlier conversation with Philip. "Perhaps there is a way to live together with Mikhail" - as that thought crosses Yuliy's mind, Kershner is just a breath away.

The military interrupts the vampire assault on the mansion. Mikhail and then Kershner tell Yuliy about the Ark and how it relates to his past.

Alone, Yuliy heads to southern Karafuto/Sakhalin on the trail of the Ark of Sirius. His brother and the vampire prince Yevgraf are already there.

Yuliy and Bishop meet an old man who knew Yuliy's father, Alexei, but he refuses to say anything further. In town, they run into Ryoko and Iba.

Willard and the Jaegers find an artifact related to the Ark and set out after Yuliy, who's almost reached both the sanctuary of the Ark and his father.

As Willard and the Jaegers fly towards Karafuto, Bishop makes his move. With Ryoko and Iba as backup, Yuliy confronts the vampires and his brother.

Mikhail confronts Yevgraf, but he's already consumed the Ark. With Yuliy and Willard aboard, the airship flies toward the final confrontation.