 If you liked
Prunus Girl
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 ...then you might like
Trap Heroine
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Both have essentially a very similar præmise in that a male p.o.v. character is struck by the sight of an ostensibly cute female whom he later finds out to be in his class... and male. Both explore their growing friendship and the philosophical significance of what it still means to be "male" if one appear indistinguishable from a female.