Ultraman: I Became a God by Absorbing Power

I haven't finished this book yet, but I read the beginning, but it gives me the feeling that the energy of the protagonist is one-time use, and those of Ultraman are also one-time use. After the energy is used up, it cannot be changed, and it cannot recover on its own, just like being given an experience card of Ultraman. Also, during the time period when Belial came out of the Land of Light, Seven and Leo actually couldn't recognize the clothes of his team members when they were on Earth.