This is a very basic walkthrough for the game Uni. Please let me know if any of this is incorrect, can only speak from my own playthroughs:

General advice: You can do characters at once however this might lead to you missing certain scenes. If you're very invested in one or two routes, just do those to make sure you see all the content
If you're doing the Cafe route and don't want to do and sexual favours with the landlord, don't spend money the first month as you'll likely not have enough

Damien route:
- When you see a male student bullying another, intervene.
- After this Damien will approach you. Basically be receptive to his advances and it's clean sailing
- To keep this relationship you basically just need to never admit to doing any cheating (via Cafe or other)
- It is also possible to lose him if you get sexual with him at the movies (requires high corruption). It can be saved by not getting angry when he is annoyed
Overlap: This route has 2 major overlaps with Matt and you get different text if you are seeing Violet and Kate


Matt avoid: Scream the first day and don't go shower if milk is spilled on you

Matt route 1:Submissive:
-Let him grope you the first day
-Always do as he says. If you object in certain scenes like the locker room you'll get slightly different outcomes (won't let you cum etc)
-I've been told rejecting him once he has photos can lead to a bad end but can't confirm

Matt Route 2: Blackmail
- Let him grope you but the first time he invites you out of class ignore
- when milk is spilt on you go to the showers
- This route is similar to the other but you get somewhat different text (more guilty etc)

Overlap: Both routes have overlap scenes when dating Kate and Damien. Damien in particular is very NTR heavy
The breasts scene varies greatly depending on if you're dating Damien, have only met him (turned down date) or don't know him (didn't intervene)

Kate: Romance:
- Only available if you work at the Cafe
- Avoid doing sexual favours. You might be able to pull your neckline down and still do this route but I stick to the side of caution
- that's basically it. Just play through the events and accept as many to get all the scenes (most wholesome route)
Overlap: Event with Matt and general text about feeling bad/comparing your relationships

Kate: Corruption:
- While working at the Cafe, do all the depraved options possible
-When available, encourage and include Kate
-This will eventually lead to you getting fired, take kate with you and you'll both work at the bar together
Overlap: Not directly related to Kate, but you can get events with Matt and Violet at bar if you're seeing them (often hard to get this event to show up so if you really want to see it don't see one of them or Damien)

Violet:
-This can either lead into her being a Dom or Sub 
- very straightforward, for Dom choose sub options like bossy or not putting up with her BS, for dom just boot lick and simp
- Once you're in Sub route scenes can go one way or the other depending on how well you do. Mess up to get punished or do well to get rewarded (rewarded has slightly more scenes)
- In the dom route you get to choose if you reward or punish her
Overlap: not much beyond different text and some text messages

Cafe:
-Low paying job that you can get a raise at, alternatively act corrupt and you can earn more and later move to the bar
- A lot of sexual scenes with costumers and Kate in corrupt
- Relationship characters can visit you there for one off events (not sexual AFAIK)

Bakery:
- better paying, leads to bimbofication (blond hair, bigger breasts)
- I don't like this route as most characters get annoyed at you and either threathen or do break up with you. Also has much less content when you consider kate + bar events in the other route
- In terms of scenes you get a few sexual with the manager, as well as watching a few scenes though the door between him and the staff. You also get punishment scenes (text only as of writing) from Matt and violet (Dom only I think)

Club events:
All clubs are just story atm and don't lead to any scenes with the exception of if you are seeing Damien, in which case you get one scene per club (Pretty straight forward which choice leads to the scene)

Other events:
-When shopping with Damien go into the clothing store to get a underwear pic sent to Damien (and matt if you are seeing him)
-To get involed with the guys around town, just be sexual once the option arrives
-TO get to the strip club just keep trying until you get the option to give the bouncer a blowjob and you're in