Do yosuke's quest: basically give meet up with him several times, give him items he wants, then during party break into Kan's room to get the keycard and run to reach the lab door and open it
Do yosuke's quest
- attend Friday party
- meet Yosuke at night day after party
- get the thing for him from science student (random event during the day)
- attend 2nd party
- meet up with yosuke again to give him the thing, he will ask for pizza
- cook pizza in the kitchen
- meet up with yosuke, he will point you to kan's room
- attend party to break into Kan's room to get lab key
- run until you reach lab