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Kouta is main male character of the series. He arrives in Kanagawa Prefecture to attend college, having previously arranged to stay with his cousin Yuka while at school.
Kouta enters the story when Yuka's family rents him a closed-down restaurant, the Kaeda House, as long as he maintains it, and begins living there with Yuka while going to a university. Kouta has repressed traumatic memories of witnessing the deaths of his father and sister. He suffers from Amnesia brought on by the trauma of this event, caused him to end up in a hospital for some time following the event. Due in part to his loss, Kouta is sympathetic towards girls in trouble and is extremely generous and protective to the girls around him, because he can relate to them and they remind him of his late younger sister, Kanae.
In the anime, he meets Lucy on a family vacation, while going to the mountain to draw. He strikes up a conversation with her, finds her horns fascinating, and gives her a hat to cover them up while in public. They become friends and he takes her to the zoo, telling her that he likes to look at the "weird animals."
His repressed memories are triggered when Lucy uses her vectors to kill over a dozen soldiers in front of him, afterwards singing "Lilium", the song that brought them together.
*Spoiler Alert!!*
In the last chapter of the manga, he fulfills his promise to Lucy and kills her. Later, he and Yuka are married, and subsequently name their daughter "Nyu".