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Game

Episode number: 1

Overview: Fifteen children at a summer school program encounter the mysterious Kokopelli and agree to be testers for a game he claims to have completed recently. Soon, they are summoned into the cockpit of a giant mecha, with Kokopelli piloting. Thus the first round takes place.

Zearth

Episode number: 2

Overview: The children start having second thoughts about the game, but a floating being known as Dung Beetle appears and teleports them to the cockpit of the mecha, which the group later dubs Zearth. On the evening of the same day, a new enemy appears, and Takeshi Waku is chosen to fight it.

Secret

Episode number: 3

Overview: Takami "Komo" Komoda reveals the truth to her father, and while Waku's funeral is being held, Masaru "Kodama" Kodaka is selected to be the third pilot.

Strength

Episode number: 4

Overview: Kodama fights the third enemy without caring about his surroundings, causing many casualties in the process, until he discovers the meaning of losing someone important to him.

Weakness

Episode number: 5

Overview: After the children discover the fate that awaits them, they are assembled and interrogated by the military, except for Isao Kako, who coincidentally is the next chosen pilot.

Lust

Episode number: 6

Overview: The children try to find Kako without success, until Chizuru "Chizu" Honda discovers where he is hiding and tries to cheer him up. However, Kako has other plans for her.

Wound

Episode number: 7

Overview: The story of Chizu's relationship with her teacher is revealed, before she is selected to replace the deceased Kako.

Revision

Episode number: 8

Overview: The fourth battle begins, but Chizu is more worried about taking revenge on her teacher than facing her enemy.

Family

Episode number: 9

Overview: Selected to fight the fifth enemy, Daiichi "Daichi" Yamura's final wish is to spend his remaining time happily with his siblings, but his plans are ruined when the battle starts sooner than he expected.

Companion

Episode number: 10

Overview: Bullied by her classmates because of her mother's questionable occupation, Mako "Nakama" Nakarai, after being chosen to engage into the sixth round, resorts to extremes to arrange money enough to complete a personal project of hers in time.

Life

Episode number: 11

Overview: Nagi, a childhood friend of Kunihiko Moji's needs a heart transplant, but so far the only compatible donor found is Moji himself. While dealing with Nagi's drama, he is selected to fight the seventh enemy.

Blood Relative

Episode number: 12

Overview: Maki Ano is in awe as her foster mother is about to have a baby. She hopes to at least witness her little brother's birth, but when she is appointed the pilot for the eighth round, she is left with little hope to be able to do so.

Earth

Episode number: 13

Overview: During Maki's fight, the children discover the true nature of the enemies they are battling, and what really is at stake on every single bout.

Perplexity

Episode number: 14

Overview: Yosuke Kirie wonders if he will find the resolve to fight in the next battle. While Mitsumi starts to look for means to protect the remaining children, Masamitsu discovers her secret.

Self-Destruction

Episode number: 15

Overview: The ninth round begins, but after witnessing his mother's miserable life, Kirie refuses to fight. Just when his companions are about to lose hope, something that nobody expected happens.

True Identity

Episode number: 16

Overview: Given another chance, Kirie finally decides to face the enemy, but when he surprisingly unveils Machi's identity, a commotion is created among the rest of the group.

Affection

Episode number: 17

Overview: Chosen to the tenth round, Aiko Tokosumi's life is turned upside down when a scandal involving her father brings up turmoil to her household. But she ends up finding in Kanji the strength to carry on with her duty.

Reality

Episode number: 18

Overview: After Komoda was selected for the eleventh match, her father resigns from his position as a politician, but not before revealing the truth about Zearth and the children to the world.

Mother

Episode number: 19

Overview: Tamotsu reveals to Jun Ushiro who his real parents were and tells him their story.

Ego

Episode number: 20

Overview: Machi reveals to the remaining pilots all she knows about the battles, and how she and her brother got themselves involved on them.

Truth

Episode number: 21

Overview: While Kanji fights the Twelfth enemy, the real objective of the masterminds is revealed. Later, Jun receives a proposal from Dung Beetle that may save his life if he accepts.

Distance

Episode number: 22

Overview: Jun takes Kana to her father's house, having Machi traveling with them. On the way, he reminisces about his infancy days, and later, he asks Machi's help to protect Kana from Dung Beetle's intentions.

Snowscape

Episode number: 23

Overview: The human armies decide to intervene during the thirteenth battle, while Machi betrays Dung Beetle and becomes the next pilot in Kana's place.

Story

Episode number: 24

Overview: Jun declines Seki's offer and becomes the pilot for the final round. During the long battle, he reminisces about his fallen comrades while struggling to save the Earth once and for all.