Yeah, what I've got so far is basically a fleshed-out version of the points you made in the other thread. Basically, OCR is at peace, until some robot masters show up and start ruining the city, and 1, 2, and 3-Tan all go missing. Pretzel sends 4-Tan out to find her sisters and stop the robots in each of the various sections of the site. Nice Work Guy shows up in various places with upgrades/weapons when 4-tan does nice enough work (like beating a boss). After all the bosses are defeated (I'd say 4 to 6 of them), it turns out that it was all the work of Green who's angry at being kicked out of the spotlight and wants revenge on OCR. He's kidnapped and brainwashed 1, 2, and 3, and you'll have to fight/free them as you make your way through his fortress. The final boss is, of course, Green.