メタモル・パニック DOKI DOKI 妖魔バスターズ

Hero is a high school student who secretly went camping in the mountains with his childhood friend Yuki and cousin Ai. They found a suspicious cave and occasionally lifted the curse laid on demon king. The curse shifted to the two girls with Yuki spontaneously occasionally turning into a kitten and Ai into a parrot. Youkai appear in the city and start rampaging. The three heroes stand up to the demon threat. [From vndbreview]