Although Raze was in the Alter organization, he was only in it because it benefited him. They seemed to know a lot more about the connection between the two worlds than he did.
On top of that, they had a large number of items that would come in handy for him in the future. Therefore, he thought it would benefit him more being a part of them than against them.
For the time being, it also placed one less enemy on his back. When he accepted their proposal, though, he didn't know about the Bonum Society, which now had made him a target just for being a part of Alter.
However, one thing that Alter mustn't know was Raze's true past or strength. From what he had heard, Charlotte, a member of Alter, had claimed that the current leader of Alter was a 6-star Mage.
