English is not my first language so there might be some mistakes, but is something like this:
"Momose is a math genius! he thinks that everything can be calculated... until he met Maruko Ai, a chaotic girl who believes in a "angel of love" and things like that. Maruko has an one sided love for Momose's childhood friend and now Momose is surrounded by problems that he can not solve. And the biggest problem is... love!?"

Can someone translate the summary into english pls (〜 ̄△ ̄)〜