I think the reason why Maki gets that kind of attention is because she gives out this cool beauty feel about her. She's quiet and doesn't talk to a lot of people, but once they know how tsun she is, they are compelled to glomp her.
Just look at the expression she gives to Umi before Honoka glomps her on episode 3.
To me, she's a character that even exceeds the typical moe factor since she's not so much that, but more adorable in a very likeable way where other girls just want to hug or tease her.
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