Love Chain Love Gene

Manami, a university student, approaches Kouichirou, a science graduate student as well as his older sister's arranged marriage candidate, to gauge his character for her shy sister. But, his impression is absolutely terrible! However, on a rainy day, they unexpectedly meet again...! This is a frustrating, but heart-fluttering love story between Manami, the bold Dom who charges headfirst into love, and Kouichirou, the ideal bachelor with an ironclad wall.