You can find out where to get all 5 parts of the Manuscript in Kota’s New Journey in this guide.
All 5 Coded Magical Manuscript
Steps on how to get all 5 coded magical manuscripts:
Grass Manuscript
You can get this manuscript after talking to Milchfrau
The manuscript will be with the grass
Chicken Manuscript
You can get this manuscript after talking to fisherman.
The manuscript will be in the beak of a chicken
Stone Manuscript
You can get this manuscript after you swim.
The manuscript will be under the stone
Stern Manuscript
You can receive this manuscript after you have fed and watered Stern.
Stern will give the manuscript herself
Draw-well Manuscript
You can get this manuscript with a fishing rod.
The manuscript can be retrieved from the draw-well