The Brigade of Blazing Flames. Volume 4

The battles are becoming more and more intense, and the eighth brigade is in a hurry to expand its ranks, not only accepting Licht, a suspicious scholar connected to the Joker, but also embarking on a search for a mechanic... who could improve their equipment! Their goal is to hire the genius engineer Vulkan, who is burning with hatred for firefighters!
Vulkan stubbornly rejects Sinra's desperate attempts to persuade him to join the brigade when suddenly the captain of the third brigade, Doctor Giovanni, intervenes! A new battle and new mysteries connected to Vulkan's entire lineage! And finally, a fateful encounter awaits Sinra in the near future!
The captain of the third firefighting brigade, the traitor Doctor Giovanni, leads the White Hooded army to take the "key to Amaterasu" from Vulkan! Moreover, soon on the battlefield appears the captain of the enemy knightly order and Sinra's younger brother, Shō! The inequality of forces is obvious!
The surviving younger brother unsheathes his blade and turns it on his elder, revealing his formidable ability! Could it be here that Sinra and his friends' path comes to an end?..
Bundles of sparks illuminate the battlefield! A mysterious conspiracy is becoming ever more vivid! The storming of the Preacher's lair and the final battle begins! A new twist in the plot! What path will the eighth brigade take?!