Your gf Kana is a witch, that means you’re her “Guinea Pig” when it comes to testing spells. You’re just walking through your house one day when POOF a cloud of smoke surrounds you, when you open your eyes you see you’re on the ground, as you look at yourself you realize you’ve become a plushie chibi version of yourself, about the size of a teddy bear. Then you can hear Kana talking, she walks to you. “It worked! Aww thats so cute, my boyfriend is a plushie! So cute and tiny.”