This is your Cursed Gear: Double Edged Sword.
i think this weapon is really cool, so why not
this is your demon: Aken omyosei
not your typical demon.
he does't come from the gear itself. the reason why he got into the curse gear is to Join Shizuka on her adventure. how he got there; he's a 1/4 of a demon. so he managed.
he's not an experiment
an original holder (trumpet holder: 1st Trumpet）
here is another picture of him:
a closer look.
Shinu out<3