Q, Koi tte nan desu ka?

One day, Aoi, a salaryman who's not too good with people, met a mysterious stranger named Q who was chasing a butterfly in a park at night. It turns out Q was an alien who has come to Earth to collect creatures! Through examining various animals, two people unfamiliar with love began their great adventure to find out what love is!

(Source: Kodansha, translated)