When last we left, Denki and friends discovered a whole new world called Atmos, a land of weather people called Celians! To top it off, Denki found out that he is a Celian too! A Thunder and Lightning mixed Celian to be precise! Denki is set to go on a trip through Atmos now, but first… he has to tell the family! How will they take the news? More to the point, what do the twins Umi and Arashi know about it? Find out in ThunderKid Chapter 3 – Departure!