Rare bug

Meeting Cless
After making it to the Upper New Ark, Lust Doll may visit the College to attend classes. Amongst them is the medical class; it has higher standards than the others, requiring to pass a test first to check wether Lust Doll even qualifies for it. The test's difficulty is 20+(3*Ins)%; it's not free, you must pay $50 for each attempt to pass it. If your Insight stat is too low to pass a test without wasting too much time, and you have enough cash, you can spend credits for Biology class to train it ($100 per session), though it also drains stamina.

Once the test gets passed, you must pay $1000 to attend the lecture by doctor Cless. It's one-time event, which rewards you with the Self-Healing passive skill, which heals 1 point of stamina each turn while in combat.

After the lecture, you can talk with Cless directly. He would ask you for a help with obtaining a sample of the Stinger Bug's venom; Cless can't do it himself as he's not of action type, and the Forest Park where the bug can be found is rather dangerous place. To obtain the sample, Lust Doll needs an Empty Bottle. Another problem is what the bug is, quoting Cless, is rather "shy", so they also need a lure, though that one Cless can provide for free.

Search for the bug
From now on, the bug can be met as a hostile random encounter. If defeated, if you have a bottle, you can collect some venom; Cless needs only one sample, so any excessive venom can be sold. If you lose to the bug, you would be sting, which causes a debuff which can be removed by either attending the hospital ($100) and being cured by two female nurses, or asking Cless for help (free of charge), which leads to different scenes.

Cless would pay you $1000 for a sample and reveal what there are some high-ranking people interested in it. He would also tell about such people throwing a private parties at the Gallery, and promise to arrange for Lust Doll to be allowed to attend them if they wish; they only need the be dressed appropriately, for which they can shop at the Peacock's Feather.