Mika is a bit of a tomboy, but is obsessed with the topic of love. She teases Sumire about coming back to the dorm after curfew, immediately deciding that she had to be out with some boy (the fact that Sumire came back wearing a necklace didn't help disprove her theory.) She tends to go overboard with her fantasies and ideas about Sumire's love life, particularly with Sumire's visits with Yoshiki and even the fact that Sumire lives at Veuns Vanguard, an "estrogen paradise" as Mika referred to it.
Mika has short light brown hair and reddish-brown eyes. She is typically seen wearing her school uniform.
Mika appears in the very first chapter, jumping to the conclusion that Sumire was out late because she was meeting a boy, based on the necklace she came back wearing.
In Chapter 18 when she comes to visit Sumire with the other girls, we find out that they are all 14 years old, only a year younger than Lucia.