Koishi Komeiji is a character in the series Touhou Project. Satori Komeiji's younger sister. To escape the fear and hatred which other beings feel towards the satori species, she attempted to destroy her mind-reading ability by closing her Third Eye. However, this had the side effect of sealing away her own conscious mind, causing her to lose all thoughts and motives; she could no longer be hated, but neither could she be loved, or even remembered by people who saw her. Her actions are controlled entirely by her subconscious, Koishi's presence cannot be noticed by other beings unless she allows it, even while standing in plain view because she's closed her mind, or her Third Eye. She can manipulate the unconsciousness of every living thing around her, allowing her to make them see everything she desires, and make them confront their own weaknesses hidden inside their hearts
- Koishi's most important relationship is her older sister, Satori Komeiji. Despite Koishi closing her mind and seemingly whimsical wandering with conscious mind sealed away, and even if she lost all her thoughts and motives, she still recognizes her and likes being around her.