This event is a scam on newbie....
We get 1 point for every note, and 4 points for every note doing the event song (15 for ~60). It means every energy, we get 5 event points.
To get SR Nico. You need 13000 points, or 2600 energy, or 15600 minute. You have 10 days to do this event, and it only 1440 minutes a day. Assume we get some energy thank to level, then we still need 240 energies, or roughly 6-8 levels, which is quite significant.
In short i don't know how many points normal difficulty gives, but it requires 10 days continue playing without sleep for the newbie to get SR Nico. Which is impossible almost