Dan-U (a Touhou LW original) refers to rain that feels like a bombardment of bullets. This is an apt temperament for Mononobe no Futo, who wields a combination of ancient Mononobe secret arts and new Taoist techniques. Since she was sealed underground during her long sleep, she lacks the three Essences of Sun, Moon, and Star. Futo is endowed with Fire Phase as she engineered the conflagration of temples, and Water Phase because she is quick to adapt, like when she turned against her own clan. The formless and passionate Fire Phase resists Wood Phase, because wood feeds fire, but it is weak to Water Phase, because water dampens fire. The flexible and patient Water Phase resists Metal Phase, because metal collects water, but it is weak to Earth Phase, because earth directs water.

The ability of Mononobe no Futo from a world overflowing with divine spirits (a Touhou LW original). It's basically the same as our Futo's ability. Futo was probably the most dismayed out of anyone with the prolonging of the 13th incident. She had betrayed her own clan and family and was ready to throw everything else away, all for the sake of Miko's resurrection. Everything should have been prepared to perfection, so why didn't it work? Futo was under no illusions. She knew she wasn't especially wise or intelligent. While she may have received tutelage alongside Miko from the Mibube, the greatest teachers in the land, the Mononobe clan was full of many more talented individuals who had also mastered the Mononobe secret arts. That's not even mentioning the members of the other powerful clans like the Soga, who could be considered even smarter than the Mononobe with their knowledge of the latest Chinese technological innovations. Regardless, Futo's intelligence, or lack thereof, shouldn't have had any influence on the resurrection plan's success. The Mononobe secret arts and the Taoist techniques of Chinese sages work so well together because they both originated from the same thing: animism. The fundamental ideas of animism are that everything has a soul and that the universe is composed of temperament. These techniques seem like mystical charms or magic to the layman, but for the master, they are simple conversations with the universe. They ask for boons, and the earth, sky, mountains, rivers, lakes, and forests answer. Conversing with the universe in this manner is known as feng shui. Once you get the universe to agree to something, it will always uphold its end of the bargain. It may take some time, but even the most grandiose boon will eventually be granted. Everything for Miko's resurrection had already been arranged, so Futo couldn't have possibly messed it up. The most likely explanation is that Buddhists delayed Miko's resurrection as payback for her exploiting Buddhist teachings to hide her true motives.