Nyan Koi! Ep. 01
The Ugly Cat and the Cursed Highschooler - ブサイクな猫と呪われし高校生 (Busaiku na Neko to Norowareshi Kōkōsei)
"Nyandaful!" by Yui Sakakibara
~Amaku Setsunai Namida~" by Asami Imai
Junpei is a normal high-schooler who happens to be allergic to cats. Despite this, his family keeps one named Nyamsus in the house.
One day, he kicks a can out of the way, but hits it so hard that it knocks off the head of the Jizou cat statue outside a shrine. Despite putting the head back on as fast as he can, he is informed by Nyamsus and Tama (another cat) that his actions have angered the cat god. If he doesn't fulfill the wishes of 100 cats, then he will turn into a cat himself and possibly die from the allergic reaction.
Soon after that, a cat comes up to him with a request: his brothers are being traumatized by some human who looks innocent at first but after luring the cats to itself then grabs them and won't let go. The cats are freaked out by this human and want Junpei to make it stop. He tries to help him out, but then discovers that the human in question is his crush, Kaede. He is reluctant at first to tell her to stop grabbing the cat, but then Nyamsus and co. start moving closer to him and nearly triggering another allergic reaction until he screams at them to stop, causing Kaede to drop the cat and run away.
After clearing up the misunderstanding with Kaede, Junpei goes home and wakes up the next day, thinking the danger has passed. However, Nyamsus is still able to talk to him, sarcastically asking if he really thought it would be that easy to get rid of the curse.