In this story (and according to Touhou Wiki, in canon as well), maneki-neko are normally white-colored, and Mike was bullied in the Outside World by the white maneki-neko for not being white.
Oh so it's like South Africa, okay. Joke aside, I get it, thanks for the explanation. Sorry, I didn't notice there was an entire story.
Who's going to accept me?It's not fair.What about me?Is it my fault?No, it's all because of my fur.I wouldn't have to deal with this if it was just white.I wish I had white fur too.Why? You're a calico just like me.Aren't we all supposed to be ostracized?Even among calicos, I'm a breed apart.It's not fair.It's not fair.What about me?What about meWhat about me!?I deserve to be happy, too!!