I think Ami might be the last person Akira wants to have a serious conversation about Sekai with.I think Ami has a real chance of talking to Akira about Sekai (she already has after all, straight up told him about him having sex with her mom)
He doesn't want Ami to become like Sekai, but he also very quiet and reluctant on commenting on the reason why. Ami has a very skewed idea about Akira & Sekai's relationship, thinking it is similar to her own feelings on Sensei: a forbidden relationship unacceptable to society, but that still managed to blossom into something beautiful because of the pure love they had for each other.
Her delusion towards Sekai is to the same extent or even worst to the delusional image Chika has towards Akira.
Ami has read Sekai's poems, and has been heavily influenced by them, but most likely she ignores or blanks out the parts that paint Sekai as a monster, while Wakana and Nodoka are capable of seeing the whole picture through their own unfiltered perspective