"Keiko Shimura is one of the main characters in the Japanese manga Ghost Terminal. She is a 16-year-old high school student who lives with her parents and younger brother in Tokyo. Keiko is a smart and resourceful girl who has a passion for solving mysteries and puzzles. She often spends her free time exploring abandoned buildings and searching for clues to unravel their secrets.

Keiko is a skilled hacker and computer expert, which makes her invaluable to the Ghost Terminal team, a group of teenagers who investigate supernatural phenomena and other unexplained events in Tokyo's underground tunnels. Keiko is responsible for hacking into computer systems and retrieving information that helps the team solve their cases.

Although Keiko is highly intelligent and has a logical mind, she is also very empathetic and caring. She often serves as the emotional anchor for the rest of the team, offering support and guidance when they are facing difficult situations. Keiko's calm and level-headed demeanor is a valuable asset to the group, especially when they are in dangerous situations.

Keiko's relationship with her family is also an important part of her character. Her parents are often absent from her life, which leaves her feeling lonely and isolated. However, she has a close bond with her younger brother, who often accompanies her on her adventures. Keiko is fiercely protective of her brother and will do anything to keep him safe.

Overall, Keiko Shimura is a complex and multidimensional character in the manga Ghost Terminal. She is smart, resourceful, empathetic, and caring, making her an essential member of the team and a fan-favorite among readers."