Isumi Marika is a character that appears in Kimi ga Ita Kisetsu and Muv-Luv Alternative Chronicles Inheritance. She is the second youngest of the 4 Isumi Sisters. An Eishi and a First Lieutenant in the Imperial Japanese forces, Marika was stationed at the Second Defense Line on the Japanese mainland at the time of the Sadogashima hive operation.
- She has the smallest bust (B78/W53/H80) compare to her sisters.
- Marika and Akira have a strange habit of enjoying resembling other Muv-Luv heroines a little too much (that mean cosplaying them).