Aizen

Aizen (アイゼン) is a mysterious man that Matsuri found unconscious on a pile of trash near the wall. He is looking for a black key.

Appearance
Aizen is a tall young man with black hair, and white eyes. He wears a long, black jacket with a red sweater underneath, along with black boots. He carries an unidentified object on his back.

Personality
Aizen has an inquisitive personality and is shown to bicker with Matsuri. He has a one track mind when it comes to getting information about the key, and seems unfazed by dangerous situations.

#001
Matsuri finds him on a pile of trash near the walls, unconscious. She tries to stick a piece of candy in his mouth when he opens his eyes. In his dazed vision he sees a (seemingly Matsuri's father's) chest with a black key hanging from a necklace squarely in the middle. Aizen reaches out for it, but touches Matsuri's chest instead, which angers her and she throws her basket at him in retaliation. He wonders what he did wrong, and the two bicker. Aizen asks her what she was doing when she found him, and also repeatedly asks Matsuri if she knows anything about his black key. He doesn't believe her when she says that she doesn't know what he's talking about.

At some point, she manages to shrug him off following her. He eventually finds her again, while she is trying to avoid getting killed by an unknown group of people. She calls him a pervert and he replies by stating it's rude for him to call him that. While the two bicker, the gunman shoots at him and seemingly fail to injure Aizen. He then grabs the bullet off the ground and flicks it back at his assailants, resulting in the bullet going through the shooter's hand. Unfazed, Aizen then properly introduces himself to Matsuri.

Trivia

 * His name, Aizen (アイゼン), means “crampons”.