Yukimura and Himuro are both graduate students working in the same lab. One morning all out of nowhere, Himuro announces to Yukimura that she believes that she is in love with him, totally shocking her fellow scientist. Yukimura demands to know how Himuro has arrived at such a conclusion, stating that as science-types, they simply cannot come to proper conclusions without evidence. Thus the two begin an attempt to quantify and qualify their romantic feelings, determining that if love is, in fact, real, it must be provable with science.

[Source: Anime News Network]