Zoushoku Shoujo Plana-chan! by Haruse Hiroki — Completed

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Think Yotsuba but with a planarian/human mutant four-year-old girl instead of one with green hair.

Chapter 1 released Apr 30 '10
Chapter 2 released Apr 30 '10
Chapter 3: Plana-chan, Let's Play Dress-Up! released May 21 '10
Chapter 4: Plana-chan Grows Up released Jun 23 '10
Chapter 5: Plana-chan, is This Your First Time on an Errand released Aug 4 '10
Chapter 6: Plana-chan Reflects on Her Actions released Aug 21 '10
Chapter 7: Plana-chan and the Sea released Oct 12 '10 Beach
Chapter 8: Plana-chan, Survive the Backyard released Nov 11 '10
Chapter 9: Plana-chan and the Terrifying Mansion released Nov 30 '10
Chapter 10: Rebellious Plana-chan!? released Jan 7 '11
Chapter 11: Plana-chan and Family released Jan 30 '11
Chapter 12: Plana-chan's New Year released Feb 23 '11
Chapter 13: Plana-chan and Riku released Mar 23 '11
Chapter 14: Plana-chan's Celebration released Apr 29 '11
Chapter 15: Plana-chan and Hot Springs released May 29 '11 Hot spring
Chapter 16 released Jun 25 '11
Chapter 17: Lia's Training and Plana-chan released Jul 22 '11
Chapter 18: Plana-chan's Strange Day Off released Aug 27 '11
Chapter 19: Plana-chan at the Amusement Park released Sep 22 '11
Chapter 20: Plana-chan, Farewell!? released Nov 3 '11
Chapter 21: Plana-chan and Rinne released Nov 25 '11