Haruhiko "Aki Kizaki" Kanna
About
One day, Haruhiko discovers that at 12 AM and PM, he switches genders: during the day he adopts the name "Aki Kizaki" for his female persona, and only at night does he turn into the male Haruhiko.
The reason for his cruel behavior towards women is that every woman with a significant role in his life has ended up either disappointing or abusing him in some way.