This beer is very popular.
I am probing into why that doujinshi is so popular.
"I am the most popular berry collector around here," said the bear.
If a person has a lot of energy then they're very charismatic and fun! What's another feature of charismatic / fun people? They are most likely popular as well.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.