Kasumizawa Miyu from 'Special Response Team' a.k.a SRT

She's a girl whose shy and has low self-esteem, she's also often seen to be depressed, probably by the fact that people can't sense her presence until they unintentionally bump into her.

She got the job of a sniper by her school due to her excellency in using a sniper rifle (A 'mosin nagant' to be exact)

she got news about her school going to close for unknown reasons, so she decided to live alongside her fellow platoons in the park.