That's to be expected, you can't please everyone always and there are a lot of things that could affect that within the game.
Good spot, I didn't even notice because of the contrast or lack thereof.
Sounds like you tripped the protection against malicious saves, which yes, is a thing. I do believe there is a way to do it without this, but I'm not entirely sure of that as I don't use save editing myself (if I have an issue that would require save edits, namely red events or wrong choices known to cause red events, I start over).
Because of her actions in the later part of the story. She's shown herself to be extremely possessive and unwilling to let her partner do things that she herself will not abstain from doing.
Actually, though this is kind of true, the real reason is Rin is still on the girls side of her bisexuality and has only really swung toward even the slightest bit of interest in guys once. If she was interested to the same degree in Sensei as she was in Otoha and Chika, we would have already gotten somewhere before Otoha was an issue.
That is not and never was a problem, in fact, it's thanks to the large cast that he can alternate groups of girls to avoid burn out. Remember, the story comes first in this game, so we get Rin when it is time within the story, when she is ready to actually swing toward Sensei, and no sooner.
And also essentially cheating on Rin, which while not okay in the first place, is made worse by expecting loyalty from Rin.
I've already done this several times over, it's not that bad.
To be undeservedly fair to Otoha, I think she's also extremely impulsive and very weak to those impulsive moments, which got to her with the cheating. I mean, sure, she could have fully intended to cheat and still expect loyalty from Rin, but I am getting a sense that kiss was a heat of the moment impulse and she simply had no control. Also, at least she's self aware, some people and characters like her are not.
She's done so much damage and the only reason those two are still together, besides story reasons, is because her partner is the type that may just take it without resistance.
Yep, she could have rejected Rin, she could have been good to Rin after accepting her, but she did neither. This relationship is a ticking time bomb and time is running low. This is getting set to blow up massively, we might just see Rin in her worst state yet.
No, Rin had no idea any of this was going to happen, she took a blind leap and landed in a pot starting to boil. It wasn't until after they actually got together that Otoha started showing her negative tendencies, so it is 100% on Otoha. Also, Rin was kind of blinded with her rejection from Chika and desire for a partner that just so happened to, unfortunately, fall on Otoha.
This is true, what Otoha has done is well within the realm of normal for a teen. They are at a point where they can be extremely impulsive and may not know the full extent of the effect choices they make can have, so they can be much more free with how they act due to not being careful of said consequences.
Yep, ultimately, even with what I said above this, Otoha is guilty of several things and those things serve to build potential for hurting another character. I just hope she learns from what I see as a now inevitable negative end to the Rintoha relationship. I don't hate Otoha, she's one of my favorite characters, I'm just disappointed in her as if disappointed in a friend who messed up bad.
I would still say Nodoka is worse after the Yumi thing. If Otoha ever does something like that to Rin, I will flip a table, I swear. Still, Otoha's actions and the amount of in universe time going by before they come to a climax could serve to make the impact so much worse than the Yumi thing could even hope to be.