Sono Yubi Dake ga Shitteiru

At Wataru Fujii's school, students wear matching rings with their romantic partners. Wataru, who is not in a relationship, wears one anyway. He accidentally finds that his ring pairs with that of Yuichi Kazuki, a popular and admired senior. Despite Kazuki's generally kind nature, he is unusually cold toward Wataru. The linked rings create a strange connection between them, pulling them together despite their frequent conflicts. As they spend time together, they begin to confront the growing emotions between them.