Aion (碧海のAiON, Hekikai no Aiōn, literally meaning "Aion of Green Sea") is a Japanese manga series written and illustrated by Yuna Kagesaki. The series was published in Japan by Fujimi Shobo and serialized in Monthly Dragon Age magazine. The manga has been distributed in English by Tokyopop.

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Hekikai no AiON is a fantasy and horror manga by Yuna Kagesaki, who is also known for Sakura no Ichiban! and Karin. The series was serialized in Dragon Age from 2008 to 2012, with 11 volumes. Three volumes of the series were translated in English by Tokyopop under the name Aion before it eventually closed its North American publishing division.

While trying to live up to his father's dying wish of becoming an upstanding man, Tatsuya rushes to help Seine--his bizarre classmate--from bullies. Little does he know he is about to find himself in the middle of a supernatural war between the immortal Seine and sea creatures that can control humans. So much for being Mr. Nice Guy!

While trying to live up to his father's dying wish of becoming an upstanding man, Tatsuya rushes to help Seine--his bizarre classmate--from bullies. Little does he know he is about to find himself in the middle of a supernatural war between the immortal Seine and sea creatures that can control humans. So much for being Mr. Nice Guy!

Jul 9, 2008 · Looking for information on the manga Hekikai no AiON (AiON)? Find out more with MyAnimeList, the world's most active online anime and manga community and database. After both his parents died in an accident, Tsugawa Tatsuya is …

Tsugawa Tatsuya just lost his parents in an accident… but he's trying not to let that keep him too down as he starts high school. While trying to obey his father's final wish for him to become an upstanding man, he ends up helping a girl who was being bullied.

Plot Summary: Tsugawa Tatsuya just lost his parents in an accident... but he's trying not to let that keep him too down as he starts high school. While trying to...

Aion is a demon and one of the ‘sinners’. He aims to ‘save’ the world and plans to do this by gathering and harnessing the power of the apostles. He always has a calm demeanour but despite his seemingly genteel nature, Aion is a cruel and dangerous being.

Aion's anime & manga roles. An ambitious, powerful demon that betrayed Pandaemonium, the demon society, to follow his dream of freedom. Despite his great intelligence and resourcefulness, Aion has a weak point: his deep hatred and fear of Pandaemonium (the demon society), which affects him to the point of becoming a real obsession.