if you still doesn't understand. you need to get ending 1 for unlocking day 16 to 20 and ending 2 for unlocking day 11 to 15.
still not understand how to get ending 1 and 2? ending 1 is getting "sensitivity" above 100% from day 1 to 10. for ending 2 you need to at least not getting "sensitivity" above 100% from day 1 to 10