| Spoiler warning: Plot or ending details follow. |
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Maybe the "unfinished" ending of "Someday" is ironic. Because when Itsuki found all the effects, he just continues playing. When the player goes to the window after he wakes up, it symbolizes the title itself - "Someday, the player will get out of his room".
In the school world you find in a certain classroom a child version of itsuki who is sitting in a char alone seeing play the childs through a window. I thik that means itsuki was a solitary boy in the elementary because he was diferent than the other child, most especificaly more inteliget than the others thats why you recive the nerd effect from him, and for that inteligence the other child regret itsuki and the only thing to be acceppted by the others is being like they, maybe thats why a classmate of itsuki sends you where the monochrome effect is thats mean that his coassmate want him to be like they, but itsuki dont want this, and he prefer to be alone .