Keith is a knight who was able to get his life under control, and now is rather popular. Frustrated, he declared a challenge; the one who can unlock and open his front door will be able to get to know Keith personally, which includes dating. But the catch is, there is only one key that can unlock the door. The long-haired black cat with striking purple eyes, Black, wears the key on a chain around his neck. Lance has accepted he has absolutely no chance, whatsoever. Him, being a water mage healer, finds himself an unlikely friend who's coursing through all of Lance's walls. How will their paths intertwine? What if, in a different time, it had?