I Become Zero in the Ultraman Universe

The protagonist, Moroboshi Shin, transmigrates into the world of Ultraman, and gets Ultraman Zero from the start. The author says: “The Zero Suning gets is about the same as Go and Jack. Suning can switch forms here, and he has two modes. The first is the Mobile Ultraman form; the second looks like the one from the TV series and can grow giant. Also known as Mobile Zero.”