Anthocyanin changes colour in different PH. Red in acidic environment, blue in basic. As the ripe pear is probably supposed to be reddish, Minoriko smashes it into "sour" person's face.
Hahaha. It's not actually a mutant. The pyrus pyrifolia (Asian pear) are often called "apple pears" because of their appearance and because they have a crisp, apple-like texture. This would certainly appear to be one, though. If I had to just guess, it might be a Kosui variety?
Google helped me :) Search results said that in certain old Touhou games, Marisa(魔理沙) was written 魔梨沙 as a mistake. And Marisa that time wore clothes of purple colour like 2nd panel. So I think a kanji 梨 reminded the author of these facts and this comic. So perhaps what the author truly tried to say is just last panel. If you can read japanese, search words "魔梨沙 黒歴史" may help you.
they grow in my region, too. I want to plant one but we have too many fruit trees already
In Autumn, we have fruits like grapes, apples, and persimmons/kakis...But as I thought I should have pearsIt's a little early for themJapanese pearAnthocyanin