Reirou taru Junketsu wa 'Kouen' no Kairai o Hayarase, Gyouten ni Kirameku Akashi o Kizamu. Lyrics - BBK/BRNK

Reirou taru Junketsu wa 'Kouen' no Kairai o Hayarase, Gyouten ni Kirameku Akashi o Kizamu. Lyrics - BBK/BRNK belongs to the anime BBK/BRNK, take a look at the argument:

Unbeknownst to Azuma Kazuki, a decade away from home would only set the stage for an extraordinary and unexpected turn of events upon his return. No ordinary welcome awaited him, as he found himself mercilessly ambushed by an army of heavily armed assailants, swiftly transforming him into their captive. Yet, Azuma's imprisonment would be fleeting, for fate had something remarkable in store. A glimmer of hope arrived in the form of his childhood comrade, Kogane Asabuki, who wielded a remarkable weapon called "Bubuki" that possessed a sentient consciousness. It was through her valiant efforts that Azuma was liberated from his captors. As the chains of captivity fell away, Azuma soon discovered an extraordinary truth: he too possessed the astounding ability to master the power of Bubuki. United with his newfound allies, their shared mission crystalized—to unearth the dormant Buranki titan, Oubu, which lay concealed in the depths of the earth. Armed with this revelation and propelled by a burning desire for knowledge, Azuma embarks on an exhilarating quest to unravel the enigmatic truths veiled beneath the Buranki's surface.

Now that you know the argument, take a look to another songs of BBK/BRNK also called Bubuki Buranki | Bubuki Buranki: Hoshi no Kyojin | ブブキ・ブランキ