After searching, head forward and use the rope to cross to the other side.
After sliding over, there's a save point on the right.
After saving, proceed to the platforming section ahead. You need to press the spacebar twice in succession to cross these wooden planks.
Pay attention when you reach the first wooden plank ahead. Look to your back left; there's a material on the opposite side.
After obtaining this material, move forward to collect Memory Flower #1, "Taboo Turbid Sutra."

