This walkthrough for Onimusha: Way of the Sword guides players through the "Careful What You Wish For" side quest, in which protagonist Miyamoto Musashi investigates the eerie Yasui Konpiragu Shrine in Eastern Kyoto after hearing locals' tales of fate-changing prayers. The quest forms part of the game's Eastern Kyoto content, tasking players with gathering clues, recovering three stolen shrine statues, and ultimately purifying the site by defeating a boss.

The guide details a multi-stage process: talking to NPCs to gather clues, tracking down the three "Stout Pillar" statues hidden across nearby buildings while fighting off genma enemies, and returning them to the Hachidai Rikison Shrine. This triggers a boss battle against Rasho-Gan, a three-phase fight across two life bars in which players are advised to use their bow early to sever the tether linking the boss to a pillar behind it. The walkthrough also notes an optional, unrelated side event where players can rescue a villager from genma for bonus upgrade materials.