After claiming Everythinggj, return to the main menu, select "Mirror Travel," choose "Approach Path," and hold F to teleport there.
After teleporting, you'll arrive at Kiyomizu-dera in the DEMO. Hold SHIFT to run.
Keep moving forward and defeat the two Genma ahead.
Besides Yellow Souls, defeated enemies may also drop other colored souls. Red Souls can be used for various enhancements.
Keep moving forward until you reach a wooden door. Defeat the group of Genma guarding the entrance.
Push the door open. There's a chest by the roadside ahead; open it to get a "Regeneration Pill [Small]". Press Q to use items, and hold TAB to switch between them.
Continue forward and prepare to head to the Oni Stage. Press H to open the map and check the target location.
Follow the path forward. There are many enemies along the way. Watch out for the archers' arrows and block or dodge them.
Walk to the corner ahead. You need to defeat these two melee Genma first to open the main path on the right.
Head up the newly opened path to the right, pick up the glowing item on the ground, and take out the archer on the left.
After defeating them, jump down directly. There are Onibi to collect on both the left and right sides.
Continue forward. First, move onto the platform on the left, then circle around to the platform on the right, which has a chest containing the material "Whetstone."
Continue forward to reach a new save point. Break the chest on the table to the left for materials (drop rate uncertain). Save your progress.
