Mystical Chain is a Touhou Project fangame produced by LION HEART.

Somewhere in Gensoukyou, there is a grimoire called "The Book of Renkan. " I don't know the details, but it is rumored that "whoever possesses it will receive ancient wisdom. " It is also said that the book "resonates with powerful magical and mystical forces and appears on the spot by itself. " This would mean that the book is likely to be in the hands of a powerful youkai. If that is the case, the story is simple. In short, we should challenge all the powerful youkai to a fight and defeat them all. If we go on a rampage, it may be easier to find the book we are looking for. Two birds with one stone. Two wizards bumped into each other. They were thinking the same thing. Let's form a united front here! --Let's make a joint front!