Do you know this manga?(yaoi)

Cyber May 25, 2020 4:46 am

So I remember reading this manga a long time ago where a cute boy with half black and blue/green walks up to this other guy to help him with a graph equation so the guy helps him and when they solved it the graph points made a heart if you know what I'm talking about plzzzz let me know the title or where to find it

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