I'd like a UFO 4koma. The general story would be about Muramasa riding ships all around Gensokyo doing Missionary work for Byakuren, reaching out to all those poor oppressed youkai and/or trying to foster in a new age of humans and youkais being friends for all. Of course, some youkai aren't particularly fond of this idea (that time they tried to convert Yuka ended up being particularly disastrous). Coming along would be Nazrin (usually for some unrelated task for Shou, or just to see if she can find some treasure to help fund the temple), Kogasa (who isn't really a member of Byakuren's temple at all but hopes to get new inspirations on how to surprise Gensokyo's unsurprisable humans), and Nue (who's really just tagging along because playing pranks on Murasa is funny). Shou is also Murasa's rival and the two are constantly trying to prove themselves better than the other.
Murasa also typically tries to get donations (along with Nazrin's treasure hunting) for Byakurin's shrine. They need the money because Murasa keeps ship-wrecking all the ships Byakuren gives her (flying ships aren't cheap, you know).
At the end of one chapter, she crashes a ship into Tenshi because Tenshi's being annoying.
At another point, they need to use Kogasa as a sail for their sail boat.
It kicks off another story arc where Kogasa's umbrella gets blown away in the wind. In the interest of helping a poor grief-stricken youkai, Byakuren asks Nazrin to help Kogasa find her body. Nazin then orders all her mice to retrieve and bring back every umbrella they find. The mice return with Yuka and Yukari's umbrellas. ...followed by a VERY angry Yuka and Yukari.
Byakuren (with a teary eyed Kogasa next to her): Perhaps you should narrow down your search.
Nazrin (to her mice): Okay, gang! This time I want you to find the ugliest hideous most disgusting umbrella ever! If the umbrella you find doesn't make you want to kill yourself just because your eyes can't unsee the horrible abomination that they've seen, then that umbrella isn't ugly enough!
Kogasa: WAAAAAAAAAAAAAAAAAAAAAAH!!!! (Kogasa's cry knocks a surprised Byakuren and Nazrin down)
Byakuren wants to help with ushering in the era where everone is friends. That doesn't mean it's going to be easy, though.
Byakuren is looking through some papers: It's getting hard to keep track of the temple's finances. Shou, can you go over this?
Shou (looking through the papers): Let's see... ship repairs and maintenance expense, groceries, Tewi tax, medicines, blankets, Tewi tax, advertising costs, Tewi tax, Tewi tax...
(later)
Kogasa: Whatch'ya doing?
Shou: Be very very quiet. We're hunting rabbits.
Ichirin: Tewi tax!? I thought we were a tax-free non-profit organization!