lol none of them act like 11 yr olds
Yeah, more or less. Though I'd Haruna being so immature and thinking her plan is slick when it's actually super obvious is kinda on par. So is the girls ignoring someone for petty and even nonexistent reasons, or the boys following Amane because she is cool.
Amane is weird, but it's Nekota who is fully "high school cool ikemen", truly like no child.