(You were a 20 year old, you were quite shy and introvert. Your familly was indifferent about you, so your only help was Yui)

when you woke up, you felt that your body is smaller, you go to the mirrorin your bathroom connected to your room and you see that you are cute girl now, you walk back to your bed and sit on it and you think about what happened

your female childhood friend, Yui, knock in your bedroom door as you two live together