Slow Earthquake (a Touhou LW original) refers to seismic events where the earth shifts at a much slower pace compared to regular earthquakes. This is an apt temperament for this Koishi, who knows the joys and sorrows of not being noticed in class. Koishi really enjoys being invisible, but sometimes it makes her feel lonely. (Strong against Moon Essence.) She digs holes, digs out weeds, and makes the garden look nice and tidy! (Strong against Wood Phase and Earth Phase.) She plants pretty flowers in the hope that people will notice them. (Weak to Star Essence.) Spring is the season of rebirth that follows winter, the season of death. Animals emerge from their burrows, and plants sprout up from the ground. This world's Koishi digs so many holes because she's dying to know how this works.

The ability of Koishi Komeiji from the world delirious with eternal spring (a Touhou LW original). This ability is essentially the same as the abilities of Koishis from other worlds. Similar to the events of our world, people only began to remember encountering this Koishi after the spring-themed disturbance with the Palace of the Earth Spirits was resolved. However, this doesn't necessarily mean no one encountered Koishi earlier. Koishi is hard to notice, so she doesn't leave much of an impression. That said, there are some who claim to have met her long ago. Koishi's world is a variant of the beach world of eternal summer. The cycle of water rising from the sea to the sky and back down as rain is also the cycle of dragons and one of the temperament cycles. The large volume of water that formed the ocean in the summer world evaporated into the sky and fell as rain, bringing a new abundance of life that turned Koishi's world into a world of eternal spring. The many cherry blossoms in this world, along with all the other trees and flowers, seem unusually vibrant and full of life. And it's not just the plants. The cheerful and carefree spring atmosphere has affected all forms of life and even concepts. This is apparently why school, a place of new beginnings, has such a strong influence on this world. But is that the only reason? Other, less eccentric Gensokyos have a temple school, and the people living there know a little about how schools operate in the outside world, but they don't go crazy about school whenever spring comes around. This world's Koishi believes the secret to this mystery is buried underground. But this isn't a conscious thought. It's more of an instinct. And there are a few factors that indicate she might be right. The soil acts as an incubator of rebirth. The daughter of Fujimi sleeps in the soil beneath the Saigyou Ayakashi, and the nobles of the Asuka period (538 to 710) were found underground. The Underworld is a sealed paradise, and Hell is a place where souls repay their debts before proceeding to the next life. The god who creates earthliness is also a Mother Earth goddess. Koishi was digging for these secrets when she stumbled upon a vampire princess cooped up in her room.