Hey guys can someone tell me on how to get shuu route?
You mean how to start it? If so, just go to the mansion after your landlord tells you about a job there. Click the paper/poster on the wall and enter the elevator to answer Shuu's special question and get the job. As long as you keep visiting Shuu, he'll eventually start hanging out outside his apartment and you'll get more chances to romance him throughout the game, especially once you get his number and can invite him out on dates.