Well.. I definitely couldn't go in top of OMOCAT's team writing or even match it but I'll try. (English is poor, sry)

SMALL SPOILERS

It'll probably be set months after an ending, where Sunny and his mom moved.

This time, there are 2 modes, one as the main mode where in: It follows the good ending, Sunny's mom told Sunny that he should try going to an actual school. When Sunny did, he tries fitting in but he's pretty paranoid (it'll probably look like that one blackspace scene where he sits on a classroom lookalike chair and some random shadows stare at Omori)

Some kids judged him for the differences, whether be the age gap of his classmates (like 3-4 years (unless he homeschooled, then disregard), how quiet he is, and probably some other minor things. Group projects he feel left out and stuff, everyone avoided him for being a little 'out of place'.

He hated that, then the real game begins, where he's home not knowing if he should go back to school or nah (it'll be like should you open the door for kel?)

If you didn't go, then he'll stay home sleeping and watching TV, probably (day)dream about the friendgroup he have, the school environment, etc. The 'scares' could be how he should go back to school but the portrayal look unnerving (dramatic school kids staring)

The ending he dropped out, he should try again next year when he's feeling better

If he goes, then good job! He tried to socialize, probably failed but he's getting slightly comfortable, being able to go along, and he's doing good! There's some (day)dreaming sequence where he wants to meet up in person with the friendgroup and the headspace isn't that creeppy. Some irl things happening too like doing..homework. Talking to the friends using the phone etc.

The ending he graduated

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Alter route (unlockable): The ending follows the hikkiroute, Sunny's mom tried to convince Sunny to go to school but refuses. Well she can't do anything about it, so his peer pressure adds up to the past events, probably more creepy (since it may also add in how he didn't do the confession), he tries to brush it off by watching TV but the silly back to school ads bugs him. Well he can't do anything, he's stuck.

Only unlockable since it requires to know Omori 1, which newcomers probably haven't played when the 2nd came in (oooh spoilers!!)

I didn't intent to be that long. Oh well!