Yui's Sadistic Sister: A Demon's Fate

Three months had passed since Arata was defeated in battle. Right now, there is some enemies who were after (Y/n)'s blood but, luckily, she was able to defeat them. However, there was something going on with (Y/n). After Arata was defeated she began to experience some changes both mentally and physically. Her thirst for killing became more and more out of control and her mind wasn't the same as it was when Arata was defeated. Unaware of what was happening to her, familiar faces appeared during (Y/n)'s horrible hell since she was starting to lose control of herself after learning that she's a descendant of a powerful half demon.

Afraid of hurting those who are precious to (Y/n), she leaves the Sakamaki residence and goes in search for answers on why there were still some people and other demons who were after her blood. What was going to happen to (Y/n) when she finds the answers that she seeks? what will happen to her fate once she finally understands who or what she really is capable of? how will this final adventure end?