The Melody of Oblivion
Season 1, Episode 4: Monster Union
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Bocca finally learns that the robot creature he fought before was from the organization, Monster Union, who are humans who serve under the monsters, using the robot creatures as their weapons.Keiko Hamasaki, the sister of Kew, and the owner of the inn, remembers her past, and is reminded of why she joined the Monster Union. Later, the robot creature strikes again, and Bocca is faced with it again, giving Bocca a great surprise.
All Episodes - Season 1
Episode 1
Meros Warrior
Episode 2
The Beginning of a Long School Break
Episode 3
White Night Cape
Episode 4
Monster Union
Episode 5
The Voice Reaching Out to You
Episode 6
Pyramid Scheme Valley
Episode 7
Meigen
Episode 8
The Fated Road Afar
Episode 9
Apeman Turn
Episode 10
Unicorn Series
Episode 11
A Song You Still Don't Know About
Episode 12
Maze Island
Episode 13
Kurofune
Episode 14
The Entrance called the Exit
Episode 15
Fortune River
Episode 16
Sayoko
Episode 17
Having wings even though one is not an angel
Episode 18
Tokyo Station
Episode 19
The War of the 20th Century
Episode 20
The Sun Is Calling Out To You
Episode 21
Area out of Range
Episode 22
Mithranome
Episode 23
Like an Arrow that Pierced Through the World
Episode 24
And yet, the dawn of you who begins a journey