(1v1, the protagonist's CP is Severian. The author isn't very good at writing romance, and it may eventually become no-CP. Important original character CP: Asaba Yuma. Contains wolf blood, so avoid if that's a dealbreaker.)
Yaen Ravenlock has only one great ambition in life: to live well with her family and her best friend. Her greatest pleasure is watching other people get into amusing situations, like her best friend's daily attempts to win over the man she likes. It would be even better if she didn't try to poison him with her terrible cooking whenever he turned her down.
The antics of her older brother and his longtime partner are especially entertaining, too. But aren't those two acting a little strange? Are they really just brothers?
With the help of the System and her own talent for staying out of sight, Yaen has become increasingly skilled at breaking into places illegally. But if you spend enough time walking by the river, sooner or later you'll get your shoes wet.
One day, because she hadn't paid much attention when playing games in the past and hadn't attended a proper school since coming to this world, Yaen made a small mistake. She snuck into the Public Security Bureau and gave the new cat-like officer a pat. She only found out later that he was a lynx demi-human. That doesn't matter. If he looks like a cat and feels like a cat, then he's a cat.
But I digress. In short, after her best friend and big brother gave her a thorough dressing-down, she finally understood that you can't just touch a demi-human's tail. To demi-humans, what she'd done counted as a kind of harassment. Too much of a coward to confess, she tried to make amends for her mistake. So she started helping someone investigate cases and quietly doing little favors for him. She also began getting close to him and sucking up to him.
If she became his best friend, surely he wouldn't handcuff her and haul her in after she confessed to her earlier offense. More importantly, she'd heard that friends were allowed to touch a demi-human's tail! Yaen's plans were so grand they practically rattled the heavens.
Bai Zhiye: So that's how you ended up getting thoroughly taken advantage of and brought back to his nest? Friend, you're usually pretty sharp. How did you get so silly this time?
Yaen: Never mind that. Just tell me, did I succeed or not?
Bai Zhiye: My conclusion is that you had it coming.
Theme: No matter where you are, live earnestly.