There is a cross in your forehead with a thread attached to it, forcing you to search where it leads. You’re not sure how the cross got stuck in your forehead, but you are interested in seeing where this piece of thread leads. The search is on.
Your search is over. You found the end of the thread. The thread leads you to a sack (さく). A sack filled with more crosses with more threads attached to them. What does it all mean!?!