Koichi played the role of Kumaman in the drama.
In order to prepare for the part, Koichi became a homeless for a year.
Michael is throwing himself into the role very well, eh?
If you have a certain duty then it's your job to play that role. You have to play the part. Like in a play!
The reading is the same as the kanji you learned, meaning you should be able to read this one as well.