Kingyoya-San No Karisome Fuufu

Kingyoya-San No Karisome Fuufu summary:

The story of a contract marriage set in an old-fashioned goldfish shop. Asahi and Nana are newlyweds who run a goldfish shop. At first glance, they seem to be a normal couple, but in fact, they are a contractual couple who got married because of their mutual interests! They are not true husband and wive, let alone lovers. And yet...