How to find where senpai lives-

1) be on sport team with senpai
2) give senpai a ride home from sport

If you are not on a sport team with senpai here are some other methods of finding his house-

• become tomodachi and hang out with him (difficulty level- high)
•attach a gps to senpai and look up where he lives (difficulty level- medium)
• have a tomodachi who is neighbors with senpai (difficulty level- Nagito Komaeda)

If all else fails, you can just follow senpai home from school or anywhere else.