Hmm... Whaat!? Why did you have to go and get a girlfriend for yourself!!? I have a girlfriend! Congratulations!You have been chosen to be reincarnated to another world!Wait, Goddess! I can't just leave her behind! So what now, Madame Goddess?... Oh well, it can't be helped.Our motto is "Parting birds don't make a mess when they leave".
"Tatsu tori ato o nigosazu" (立つ鳥跡を濁さず) is an idiom that's usually used in reference to one's workplace or by Japanese moms scolding their kids. Basically, "leave on a good note" or in the mom case, "leave the place cleaner than how you found it". Hey, newbie. Let's have sex.