This manga's protagonist is your friendly neighborhood yandere, stalking her crush, constantly cutting her own hand, and dreaming of the day when she'll finally be noticed. She desperately clings to the past that matters almost nothing to the object of her adoration. That's mostly because her crush is a very oblivious and somewhat ditzy girl who fails to notice not only the protag but also a whole web of craziness slowly surrounding her. Saji-chan no Yami Nikki is written in a very quirky style. It combines comedic bits with an increasingly dark exploration of insanity, abandonment, and conscience. The comedic bits are usually drawn asa 4-koma, while more dramatic parts follow the regular manga format. This may seem confusing to some readers, but I personally think this continuous switching between comedy and seriousness indicates the growing mental instability of the manga's main character. I also think it's quite a witty way of representing the onset and development of madness.

Ah, and the ending is absolutely brilliant. So, if you enjoy dark, toxic, and slightly confusing stories with lots of a tad goofy grim humor, this manga is right after your heart.