Instructions
Wait until the Flower Bud Library is unlocked during mid-spring. Go to the Flower Bud Library on any day except Mondays and holidays. Make sure you visit from 9 a.m. to 6 p.m. The address of the Flower Bud Library is 4-4 Flower Bud, north of the seashore.
Listen to Maria the Librarian introduce you to the Flower Bud Library. She will return to the counter afterward. Walk up to the first shelf, which is in the upper-left corner of the Library.
Press "A" while standing before the shelf. A list of the four books available on the shelf will show up on your screen. By default, the cursor will be hovering over "Fishing Encyclopedia 1" because it's the first book. Press the "A" button to read the book.