Ultraman: Defeat the Darkness

When the SSSP, a group made up of young people looking to do good in the world, is tasked with investigating a possible giant monster, one of their own, Takeshi, sacrifices himself in order to save one of his teammates. Luckily for Takeshi, he is saved by Ultraman. Now the two are bonded as one and are tasked with taking care of the monsters plaguing the world at large.