Tomo-chan wa Onnanoko! (トモちゃんは女の子! Tomochan wa on'nanoko!, lit. "Tomo-chan is a Girl!") is a romantic comedy manga by Fumita Yanagida. It is published online by twi4 and has daily updates. It only goes on hiatus when the volumes are being published.
Tomo Aizawa was able to successfully confess to her crush Junichirou Kubota. There is only one problem: he just sees her as his buddy. He thought that she was a boy until they went to middle school together because her grade school was in a different school district.