Don't know why everyone is hating on her, he's the one who keeps rejecting her even when she made it obvious a number of times, of course she would get desperate and scared.
And the mc can't really explain things, she's the only one in the dark of course she would get insecure.
I'm team Ayumi from the start, tenshi is a nogo and Jindou is the rem of the story. Plus she keeps switching from rival to wingwoman.