Ugh... it's hard to find underrated novels that are good and focused on the yandere part. I've also forgotten some of them already. The one that comes to mind is:
'I Got the Hypnosis App, Now I Can Do Whatever I Want!'- it's pretty good
'Oh no! After I Reincarnated, My Moms Became Son-cons!'-I remembered feeling uncomfortable while reading it because of the mc so I dropped it halfway but it was yandere
'Running Away From The Hero!'- i think you already know this but just in case, I will recommend it too.
I'll also give you a harem novel that I'm enjoying right now:
'Stealing the Yuri Protagonist Harem'
'Reincarnated in The World of a Yuri Game as a Man Who Got Sandwiched by Yuri'
'The Main Heroines are Trying to Kill Me'.
This is definitely one of my fav so far ... love the whole dominant from him.. just can’t keep my mind off .. but this Abra def is bad news.. hope she don’t get play at the end . I need more xx
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'I Got the Hypnosis App, Now I Can Do Whatever I Want!'- it's pretty good
'Oh no! After I Reincarnated, My Moms Became Son-cons!'-I remembered feeling uncomfortable while reading it because of the mc so I dropped it halfway but it was yandere
'Running Away From The Hero!'- i think you already know this but just in case, I will recommend it too.
I'll also give you a harem novel that I'm enjoying right now:
'Stealing the Yuri Protagonist Harem'
'Reincarnated in The World of a Yuri Game as a Man Who Got Sandwiched by Yuri'
'The Main Heroines are Trying to Kill Me'.