Nagori Yuki (a Touhou LW original) refers to snow that lingers on the ground after winter's end or snow that falls during spring. This is an apt temperament for this Yuyuko, who continues to make her way beyond the world's death. Yuyuko's temperament has been fully reconstructed. She's a ghost who stands on the border between life and death (Water Phase). She's imbued with the temperament of the cherry tree that can't blossom, the Saigyou Ayakashi (Wood Phase). 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 strong and kind Wood Phase resists Water Phase, because water nourishes wood, but it is weak to Metal Phase, because metal carves wood.

The ability of Yuyuko Saigyouji, who has almost reached the end (a Touhou LW original). Yuyuko completely lost this ability due to a Lost Word. She is currently regaining it little by little, though not through restoring or replicating her old ability, but with a newly constructed original ability that formed a core to build upon. She has continued to travel across worlds to try and end the Lost Word Incident. In the cycle of life, the four seasons, spring, summer, autumn, and winter, correspond to birth, growth, fruition & decline, and death, respectively. And just as spring follows winter, rebirth follows death as the cycle continues. This cycle is also known as the karmic cycle, and the process of rebirth is known as reincarnation. To explain the concept of "life," you also need the concept of "death." All living beings die, and it is only through living that one can die. You can't refer to a being that doesn't die as "alive." According to one record, all beings exist on the infinitesimally thin line between life and death... The transition from winter to spring is the same as the one from death to life through reincarnation. This makes Yuyuko's Spring Snow Incident an infinite series of reincarnations, meaning it will never end. The incident directly brings attention to the land of Hourai, which is free from both death and life; Yuyuko's existence as a ghost removed from the karmic cycle; and a dream for revival that will never come true. It's thought that the daughter of the Fujimi family written about in an old record was Yuyuko Saigyouji before she died and that hers is the body buried beneath the Saigyou Ayakashi. In other words, it's Yuyuko's body buried there. When the Saigyou Ayakashi reaches full bloom, that body will revive, and the ghost Yuyuko will be reborn as a human. However, she'll also experience the passage of 1,000 years all at once, causing her to vanish in an instant. The Saigyou Ayakashi is a greater youkai that used to drain people's life force with an insatiable thirst, but now, it's sealed away by Yuyuko's corpse, never to bloom. It's thought that Yuyuko doesn't know that, however, on account of her losing her memories. Even after the incident ends, it's likely things will remain that way. When Yuyuko came face-to-face with the Lost Word Incident and its power to erase both life and death, there was surely nothing she could have done. However, if the Saigyou Ayakashi remembers Yuyuko from before she died, perhaps it can awaken the Fujimi family's daughter and tip the scales in Yuyuko's favor with a powerful "invitation to death." Swords That Can't Cut Yuyuko's Blue Blossom Blade and Blossoming Blade are wooden swords made from fallen branches of the Saigyou Ayakashi. Youmu's Hakurouken is the treasured sword of the Konpaku family, and her Roukanken is a blade forged by youkai. On the other hand, both of Yuyuko's swords emerged from among the Saigyou Ayakashi's branches as reproductions based on the Saigyou Ayakashi's memories of the Konpaku family's swords. The Saigyou Ayakashi is far bigger than any other cherry tree, with its branches being considerably thicker than a normal cherry tree's trunk, meaning Yuyuko's wooden swords are of the highest quality. Moreover, since the Saigyou Ayakashi is a greater youkai, they are also greater youkai swords. However, since they're wooden, they can't slice through anything, and are known as "Swords That Can't Cut," with the fictitious style of swordsmanship Yuyuko practices with them being known as "bladeless." The lower these two swords' cutting potential, the better they can exhibit their power. There are so few things they can cut through that their cutting potential becomes negative, giving them the power to "un-cut" that which has been cut. Blue Blossom Blade This is the longer of the two Swords That Can't Cut. It's a wooden sword that emerged on its own based on the memories of Youmu's Hakurouken carved into the Saigyou Ayakashi's rings. The Hakurouken slices through regrets and sends spirits of the dead to nirvana. The Blue Blossom Blade, on the other hand, induces regrets and prevents the spirits of the dead from moving on. Furthermore, the Japanese word "seirou" (lit. "blue blossom") means the abode of a nobleman or beautiful woman, while "hakurou" (lit. "white blossom") means the abode of someone of low status. Blossoming Blade This is the shorter of the two Swords That Can't Cut. It's a wooden sword that emerged on its own based on the memories of Youmu's Roukanken carved into the Saigyou Ayakashi's rings. The Roukanken contains the power to slay ten phantoms with one cut. The Blossoming Blade, on the other hand, prevents even a single phantom from perishing. The Japanese word "rouchu" (lit. "blossoming") means indoors, while "roukan," (lit. blossom viewing) means to look out at cherry blossoms.