Ougimonogatari

"It's an unfashionable monster. Even vampires are no match for them." Araragi Koyomi was consulted by his friend, Hamukai Meniko, about her falling out with her boyfriend. He himself had just been told by Hitagi Senjougahara that she is breaking up with him — along with an apology. Koyomi deduced that this commotion was the work of oddity. He goes to Oshino Ougi, an expert in the field of oddities. This modern day oddity! Oddity! Oddity! (Source: Kodansha, translated)