
An Oath Made in the Underground is the eighty-seventh chapter of the Fullmetal Alchemist manga, part of the Promised Day Arc and the twenty-first volume. It first appeared in Japan on September 12, 2008.
Numbered eighty-seven in the series, this chapter belongs to the Promised Day Arc and is collected in the twenty-first volume. It continues from the previous chapter, Servant of Darkness, and leads into the next, The Understanding Between Father and Son.
The installment keeps the Promised Day storyline in motion, occupying the slot between chapters eighty-six and eighty-eight. Its title points to a vow sworn beneath the surface as the endgame closes in.

Naruto vs Luffy with the twist nobody asked for: Luffy tickled Hinata on date night, and she kind of liked it. We break down the whole fight and commit to a winner....

There are no women on Namek. That isn't an oversight, it's the biology. Why we handed Piccolo the one thing his own species rules out, and why it had to be trap soul....
Chapter 87 is titled An Oath Made in the Underground and is part of the Promised Day Arc, collected in volume 21 of the manga.
An Oath Made in the Underground is known in Japanese as Chikado no Chikai.
The title An Oath Made in the Underground points to a vow sworn beneath the surface as the series' endgame draws closer.
An Oath Made in the Underground was published in Japan on September 12, 2008, with the English edition following on November 17, 2009.
Chapter 87 follows Chapter 86, Servant of Darkness, and leads into Chapter 88, The Understanding Between Father and Son.
Looking for more on Chapter 87: An Oath Made in the Underground? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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