A great war occurred in the 20th century between humans and monsters. Since that time, the monsters rule the world in fear but keep relatively hidden from public view. A boy named Bokka ponders the past and wonders what became of the Meros Warriors who defended the world so bravely against the demons. He soon meets Kurofune and learns of the power of the Meros and the I-bar machines they ride in battle. Warriors are the only ones who can see and hear the Melody of Oblivion, a phantom girl hidden away waiting to be rescued and be the savior of mankind. During a battle between Kurofune and a demon, Bokka discovers something only his wildest dreams could possibly imagine...he too can hear that melody. Throughout his journeys, Bokka meets many monsters and their agents, friends, and companions as he discovers the true extent of his new powers. He must continue to battle evil in the hope of releasing Boukyaku no Senritsu and free a world that has forgotten its once beautiful melody.
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(Source: Anime News Network)

Episode 1 - Melos Warrior

Episode 2 - The Beginning of a Long Journey After School

Episode 3 - Cape of the Midnight Sun

Episode 4 - Monster Union

Episode 5 - The Voice That Will Reach You

Episode 6 - Valley of the Pyramid Scheme

Episode 7 - Crying Strings!

Episode 8 - The Distant Road of Destiny

Episode 9 - Bay of the Ape Man

Episode 10 - Unicorn Series

Episode 11 - The Song That You Still Don't Know

Episode 12 - The Labyrinth Island

Episode 13 - Kurofune

Episode 14 - The Entrance Named Exit

Episode 15 - Fortune Canal

Episode 16 - Sayoko

Episode 17 - Angel Wings for Non-Angels

Episode 18 - Tokyo Station

Episode 19 - Twentieth Century War

Episode 20 - The Sun is Calling You

Episode 21 - The Range That's Outside the Range

Episode 22 - The Mitranome

Episode 23 - Like an Arrow That Pierces Through the World

Episode 24 - Beginning Your Morning Journey

Gainax

J.C. Staff

Kadokawa Shoten

KENMedia