I don't think that this arc is that bad at all.
You think Kase putting her long-term relationship up for a bet isn't bad?
The bet is about Kase leaving the dorm or not. We all know Kase loved by many, and with no proper explanation i do think that her friends (fans) will against it (but i think their response is too much tho, just let the poor girl go). Inoue senpai said it too that Kase should just accept the bet to not leave a bad taste when leaving, so i do think that this bet is something that Kase can't avoid tbh, except if she's just coming out to everyone there which i think she not ready yet (i do think yamada more ready than Kase in coming out matter). The problem is, which annoy me the most in this arc, is the lack of communication and explanation from Kase to Yamada about this matter that makes it look like Kase doing this only for Fukami, when actually everyone else is involved as well.
Not to mention it's on the heels of some other stuff, like when she assaulted some guy for being too close to her girlfriend. These two are cute, but I have a hard time agreeing with a LOT of things Kase does in the sequel series.
That's the product of lack of communication between kase and yamada, plus the jealousy problem from both side actually (but more on kase honestly) which i hope they will work out on next arc