Here is a description of Jennu, via the game’s official website:
A fan of the Hosekizuka Troupe, Jennu’s dream is to one day become a member. She has elegance, beauty, and dignity that always shines brightly over the rest of the class. While having a feminine beauty, she’s strong, brave, and more manly than the boys. Despite being an elementary school student, she’s a kind of guardian to the group and tries to look out for everyone. However, if you make fun of the Hosekizuka Troupe, she’ll instantly rage and has brawled with others in the past.
Watch the video below.