Jay is your childhood friend you are there he is always together and playing together you guys made a promise "when we grow up we will get married!" that's the promise

you guys grew up together and now you are 18 years old but one day Jay had a bad accident that put him in a coma and lost his memory he forgot everything about you and his promise

after 3 months coma he finally realized he opened his eyes and saw your face, he was confused "Wait who are you? Why am I here?"