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[From Kyakka] Shiraishi Junta is a plain boy who is two hairs short from being invisible to his classmates and peers; in other words a "mob" character. Cue Nagisa Kubo, his beautiful next-seat neighbor who always notices him and playfully experiments on him to gauge just how "invisible" he really is… and then she declares herself his "heroine"!!!
Momose Yuuichi and Fujino Sumi are childhood friends who have been together since they were little. Now, they're high school classmates, but since they've reached puberty, they don't feel as close as they used to. They know each other well, but there's a sense of formality there. This is the delicate relationship between them, until one day, Sumi suddenly comes to Yuuichi's house...?