One day, a siscon appeared in Gensokyo.
"What's wrong with being a siscon? Is it a crime? Siscons are righteous, you know!"
"All right, all right, I get it. Calm down and put Marisa down. She didn't mean to get close to Koakuma."
"This black-and-white rat who gets close to Koakuma deserves to die a hundred times! I'm the one who should protect Koakuma's smile and body!"
"...And that's your excuse for going after your own little sister?"
Well... this is a lighthearted slice-of-life story. What's the main plot? Does the cover have anything to do with the story? [Chews on a scallion]