1.Keep doing investigation request in news until information level reaches 100%. You can only do this once a day. But you can spend money gaining information level when Sakura asks you in night events. Events are random, but Sakura shows up more frequently (and price is more expensive) in latter period. So if you’re unfortunately not able to reach in rest of days, this is another way to make up.

Sakura information event:
Cost/Information level: 40%/+6 30%/+6 15%/+3 10％/+2

News Events will unlock when information level reaches a certain percentage. Be sure to watch!

2.Each girl's affection needs to be over Lv.12 before watching the 11th News Event.

Note: The third evaluation is unnecessary to pass. As long as you watch the 12th News Event, the game will end no matter what day it is.

BTW, in the 8th News Event, you will get one of two items depending on your choice. If you want them both, just reload and choose the other option. And then go to the end. Carry one till the end and do it again with the other. You will obtain these two items in next run.