Yamada, whose sexuality is never expressed, is only allowed to be attracted to Kase and no other women.
Yeah, that's like what ? A lot of Yuris about there. Most of yuri never outright told that the MCs are lesbians, they just happen to fall in love with a woman, like Yuu or Nanami in Yagate or like Mei in Citrus.
So Yamada and Kase are essentially het cucked to each other.
What does that even mean ?
That is, the only threat to their relationship is allowed to come from a strong male character.
Forgot that Inoue was a strong male character. And that's also forgetting all that happen since they're together and the many things they faced. It's like the first time a male happen to step-in and we don't even know if he is interested in Yamada.
The one lesbian character (Kase) isn’t allowed to express attraction for women.
For one, we don't know if Kase is lesbian, it's just rumors that Miwakacchi heard, there is no actual proof that Kase is a lesbian or was attracted to girls/womens before Yamada and yeah she don't express affection to others womens, she is blindly in love with Yamada and only see her as her center of her world.That's like the main aspect of Kase in their relation, she see Yamada as a goddess.
a guy that I would want to be and identify with is the only guy that is allowed into the attraction pool.
cf up here, i don't freaking know how you can forget Inoue or for that matter that Yamada is insecure about every GIRLS who are near Kase like Inoue or Kase's college roommate. but yeah "only male" hey.