 If you liked
Tousaku Shoujo Shoukougun
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 ...then you might like
Kitanai Kimi ga Ichiban Kawaii
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"My Eyeballs Told Me To Dedicate Everything I Have To You", the first story of Tousaku Shoujo Shoukougun, has themes and atmosphere that are very similar to the first two volumes of KitaKawa, with two girls secretly staying after school in a dusky classroom and expressing their feelings for each other in a quite unusual way.
If you feel that KitaKawa could be even better if it had a chapter dedicated to eyeball licking, this will please you greatly.