Chihiro (Mystery Files)
For the main page regarding this character, see: Chihiro Morimura (Child).
Chihiro is Keitaro Miura's little sister. She loves Miura and calls him "big brother." She's under Tamao Kurabe's care in 1945.
She's Chihiro Morimura's clone, created from the compatibility experiment. Upon birth, her original memories were sealed by Morimura and she lived a normal life as Miura's little sister. However, once Renya Gouto saw Morimura's experiment log from March 2nd, 2100, he abducted her from the Miura House and awakened Morimura's sealed memories. Gouto is also the one who prepared her kindergartner outfit.
For the compatibility experiment, Morimura believed she had transplanted her own memories (previously saved in Sector 0) over to her clone, Chihiro. However, the memories that she transplanted from Sector 0 actually belonged to Professor Chihiro Morimura from 2188.
She is responsible for the murder of Ms. Morimura.[1]
When the 2188 Professor Chihiro Morimura's memories were restored to Chihiro, she witnesses the destruction caused by the kaiju invasion, and the extent of the situation's deviation from her original plan for Project Ark. Chihiro decides that for her plan to succeed, she'll need a fresh start with a new world, devoid of all these problems and variables. Although they are both "Chihiro Morimura," Morimura and her efforts to enable Operation Aegis were obstacles to the original plan, so Chihiro kills her.
Though Chihiro was born on March 2nd, 2100, her actual identity is Professor Chihiro Morimura from 2188. Therefore, she has no recollection about two loops ago or the time before Chihiro was born in the current loop, as those memories belong to the Morimura from two loops ago. She also has the memories from 2188, which include knowledge about Project Ark and the simulated space, her feelings towards Juro Izumi, and her maternal instincts towards Tsukasa Okino.