Uruuno Marika has somehow slide into a parallel world where men are no more. Kazami Lily has agreed to help her on the condition that they be girlfriends, ostensibly as camouflage to help Marika fit in. In chapter 2, for their first (ostensibly fake) date, Lily takes Marika to an aquarium. There are a lot of couples in the aquarium of the yuri timeline.
Posting about some of the manga I read. I read manga in Japanese.