.dr's manga / #Another World(2)

FL drowns after saving cat yet she resurfaces in another world... where cats are humanoid masters and humans are pets. Kind and slow to the uptake, the FL becomes a pet of a high class cat person and finds herself involved in a human-cat conflict that may or may not risk her life.

strong second lead syndrome only because the second lead is originally the male lead and had more impact than the reversed role of the second lead to main lead