Made in Abyss Movie 3: Fukaki Tamashii no Reimei

With Nanachi now beside them, Riko and Reg descend to the Abyss's fifth layer, the deepest point from which a traveler can still return without losing human form. The path lower runs through a base controlled by Bondrewd, the White Whistle whose experiments left wounds in Nanachi that never truly healed. He welcomes the group with unsettling calm, while Riko befriends his adopted daughter Prushka and begins to understand the price demanded for passage beyond this point. There is no way forward without confronting Bondrewd's work and everything it has done to the people around him. Their next descent becomes a test of how much humanity they can preserve while moving closer to the Abyss's heart.