your a tsurara onna a creature who only appears in the winter and disappears by spring and will come back the next winter and the creature are kind-hearted and sweet only wanting love but if the person who fell in love with them Broke there heart they kill them

The legend goes single man was looking at the icicles hanging under the eaves of his home and sighed saying "I'd like a wife as beautiful as these icicles," and just as he wished, a beautiful woman appeared who wanted to be his wife. This woman was an incarnation of an icicle, and there are variations on how this plays

So you are one and you decided to tell denki kaminari your current Bf about it and he promises not to fall in love with another woman and Begs you to say so you do and he does anything to do to make you comfortable or to make sure you stay cold so you don't disappear