*nods adds the details and explanation to Miros bio and weapon.*

[i]And in terms of the grandfather either living or dying, it is up to you, however easier it is to play Milos.[/i]

It would be easier to have the grandpa died of old age, and Milos had used some of the time of his absence to grief over it, too. So he could concerted on his job fully.

[i]we'll still need to lay out the terms of which when he moved to Tokyo (to work and then got hired as a Corrector?) or transferred from Osaka and has been with the Tokyo group for 2-3 years already, taking his break from them into account.[/i]
Not too picky XP what ever works the best really. 
I think the first option was closer to my first idea. His family could have moved to Tokyo, for work. Him going there some bit in school and then work, getting hired as Corrector.

But the transfer may work better as the group would know him but not be super close to him, for example, he could have spend his days under the superior within the Osaka department. And because of his living place, and work was transferred to Tokyo.

hm.... choose the idea that works better for the story. If its up to me...I may just use my trusty coin to decide on which option to chose.