BEAST Chapter 19

Promise is the 19th chapter of the Bungo Stray BEAST manga.

Summary
Musing on his possible death as he and the tiger fall, Akutagawa then refuses to die as he thinks of returning to Gin, only to recall her, Atsushi, and Dazai spurning his actions. Akutagawa laments on Gin's previous sentiment and realizes that it must be why she refuses to return with him.

To Akutagawa's surprise, Kenji pierces a metal beam from afar straight through a nearby building for Akutagawa to hold on to. As Akutagawa spots Kenji, the latter throws another beam, which Akutagawa struggles to reach. With the tiger still biting on to him, Akutagawa activates Rashōmon: Ibara and impales the tiger with various thorns, releasing himself from the mafioso's clutch.

Akutagawa latches on the building's face with the help of Kenji's beam; finding the tiger fall off, he then plans to take Gin out of the headquarters. However, Akutagawa realizes that the tiger is nowhere to be found, instead finding Atsushi holding on to Rashōmon and unwilling to let Akutagawa go.

Akutagawa launches a barrage of thorns on him, all of which Atsushi evades. Atsushi avows to not let him live any longer as a promise to his orphanage director. Meanwhile, Akutagawa appraises Atsushi's strength that allows him to regenerate and come back uninjured, in addition to his tenacious resolve fueled by his past.

Though he wills to kill Atsushi, his enemy, Akutagawa turns conflicted that such nature is the evil that Gin speaks of. He also recalls Oda's advice not to chase the beast called himself, the same beast Akutagawa notions must have caused him to abandon his sister, lured him into near-death, and led him to destroy everything in his path, hence the reason Dazai refused to invite him into the Mafia.

Deciding to kill each other off, Akutagawa and Atsushi are left to resume their confrontation. Akutagawa activates Rashōmon: Ginrōkō and impales Atsushi's body with several spikes. As the two refuse to surrender, with Atsushi bent on fulfilling his promise to the orphanage director, Akutagawa eventually musters his strength to devour Atsushi in his ability. However, against all odds, Atsushi breaks through Rashōmon and remains unbroken, much to Akutagawa's shock.

Abilities

 * Rashōmon
 * Beast Beneath the Moonlight
 * Undefeated by the Rain