Little bit of a disclaimer before I start, this WILL contain spoilers for all of V's route!! Might be vague, might not be idk.
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So, all I did was stay in the group chat and didn't leave! From there I stuck to V's route while still helping Misaki with that one hit, getting the two together, and interacting with the rest of the group. I gave the group/V no reason to hate me and tried to keep it friendly, you know? Though you still get called out, but if you've done a good job of keeping things good then you'll pass without anything other than stress! [If you have successfully romanced V he'll stick up for you, along with the two you helped get together!]
When it comes time to it for Valentines day do NOT accept any flower or chocolates, accept the 3rd option instead. [Trust me on this, if you don't then you'll get the other 'good' end]. From there you should be able to convince the people that V isn't the guy they are looking for and then you can get the 'bad' end! Which is very sweet might I add!!