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Yakishio Remon -> Lemon (Losing Heroines)

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The official English release of the light novel also romanizes her name as Lemon.

Amazon's description of volume 2:

Yakishio Lemon hasn’t given up on love just yet! Even though her crush can’t seem to take his eyes off the winning heroine, Asagumo Chihaya, there’s still time for Lemon to catch up from behind. But even if she does manage to catch the object of her affection alone, can she really muster up the courage to confess? Are we about to see a Losing Heroine stand atop the podium having finally snatched victory from the jaws of defeat?

Was able to confirm both the manga and light novel are being released by Seven Seas, so it's pretty assured the manga also officially uses Lemon for the romanization as well.

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