More info: https://dlraw.net/%E3%83%80%E3%82%A6%E3%83%B3%E3%83%AD%E3%83%BC%E3%83%89/%E3%83%88%E3%83%A2%E3%81%A1%E3%82%83%E3%82%93%E3%81%AF%E5%A5%B3%E3%81%AE%E5%AD%90!/
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It's been licensed by Seven Seas Entertainment but as of now only paperback edition is available. You can buy it from here
https://sevenseasentertainment.com/series/tomo-chan-is-a-girl/
If you are fine with scanlation (or poor like me)
https://nyaa.iss.one/view/1216517
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SomaHeir
Bender22q
NotBot