Marisa eats some strange mushroom and turns into a child. Whatever she does, she's just too cute to be angry with, even when she calls Yukari granny.Mini Mari! (ミニまりっ！) is a Touhou fan Yonkoma by Beni Shake (紅シャケ), a member of the doujin circle Honey Toast.The comic follows the adventures of Touhou's token Cute Witch, Marisa Kirisame, after she eats a strange mushroom and reduced to a childish, Super-Deformed form. Reimu Hakurei at first objects to this sudden transformation, but soon grows to adore the newly-minature Marisa's sheer cuteness.Koishi Komeiji joins the two as another main character, after she tried to catch Marisa with a Master Ball, only for the ball to bounce back and capture her, making her Marisa's and Reimu's pet instead of the other way around.Mini Mari! can be read in its original Japanese on Pixiv here, and is translated into English on Danbooru (no link provided due to NSFW ads, so please look it up yourself).The comic started in 2010 and is still going strong. Beni Shake has released a few compilation books, primarily at events like the bi-annual Comiket and the annual Reitaisai festival. The latest compilation, released at Comiket 84 in summer 2013, covers the comic from 2010 to 2012.
Oh, did we mention there are more mushrooms waiting..?
—Description of Mini Mari! image pool on Danbooru
Mini Mari! provides examples of: