These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Yandere No Onna No Ko
Jumping the Shark: The 3rd CD Drama certainly gives off this feel. In contrast to the 1st and 2nd CDs' more mundane settings, here we have a robot maid who is revealed to be a secret military weapon, and a little girl who reveals to be a sorceress from another world who was reborn into a boy's body by the curse of an Evil Overlord, which makes the whole thing very jarring. At least Iori's religion in the previous CD was left ambiguous to whether it was real or not.
The 3rd CD Drama heavily implies that Tomoe is very delusional about her relationship with "Elsion" and she actually suffers from Chuunibyou. The robot, however, is a little jarring.
What an Idiot: Seriously, did you think that saying "Why are you twin girls so ridiculous?" to an angry Alice who is grieving her sister's death and is threatening to kill you was the best idea?
The Woobie / Woobie, Destroyer of Worlds: Elise. All she ever wanted was some friends and someone to love her, but Alice stole every possible friend and boyfriend she could've had (including her current one) because of her incestuous love for her. In Alice's Track, she kills herself because she can no longer stand it. In her own track, she finally snaps and kills Alice then goes to live happily ever after with her boyfriend.