Mortalis (モルターリス)/guide

Wheel (車輪)
Beach → Ocean Floor → interact with the broken wheel in the middle part.

Hourglass (砂時計)
Forest World → go between the pillars → Desert World → interact with the Hourglass.

Earmuff and Muffler (耳当てとマフラー)
Forest World → go along the road → Looping Road → go right for a while then go left → go down the staircase → Staircase Maze → interact with the ice-cream → Snow World → interact with the snowman.

Middle Parted Hair (真ん中分け)
Electro World → interact with the neon girl.

Red Riding Hood (赤ずきん)
Forest World → interact with the red book → Wood House → interact with the girl beside the house.

Albino (アルビノ)
Hospital → Hospital Hallway → 3rd door → interact with the white haired boy (known as Albino-kun) on the bed.

Encroachment (浸食)
Hospital → Hospital Hallway → Central → south → bottom-right → go down the big hole → Medicine World → crush all the pills → step on the purple puddle → interact with the NPC.