Kohei and Taichi are opposites, and that's part of what draws them together. Taichi is a loudmouth who has trouble keeping down a job, but his heart is always in the right place. Kohei is aloof and mysterious and mostly keeps to himself. Taichi grew up in poverty, from a split family, and Kohei began to lose his hearing at a young age after a bad fever.

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http://www.otakuusamagazine.com/manga-review-hear-sunspot/