ふだつきのキョーコちゃん

Kenji Fudatsuki is infamous at school for two things: being a delinquent and having an overprotective "sister complex." He's always by his sister Kyoko's side, fixing her giant ribbon and chasing off any boys who get too close. But the truth is far stranger than rumors suggest—Kenji isn't obsessed with Kyoko; he's secretly crushing on Hibino, the only girl in class who isn't afraid of him. The real twist? Kyoko is a jiangshi, a supernatural being who needs Kenji's blood to survive, and her ribbon is a talisman keeping her monstrous instincts in check. As Kenji juggles his feelings for Hibino and his duty to protect Kyoko, chaos and comedy ensue. (Summary by Grok 2)