Tachibana Kimika

"/'m gonna go to a first rate university! Then I'll be a mad scientist when I grow up! And if that doesn't work out, a NEET!"

- Tachibana Kimika, Looking-glass Insects

Tachibana Kimika (橘 希実香) is a main character in the It's my Own Invention and Looking-glass Insects chapters. An eccentric girl with an affinity for chemistry. She's a potential love interest for both Mamiya Takuji and Takashima Zakuro.

Appearance
Kimika has light brown hair she ties up into a messy bun and big green eyes. She's implied to be quite cute.

She's always seen wearing the girls Kita High uniform and black thigh-high socks.

Personality
Kimika has an eccentric, unpredictable personality, to the point Takuji is unable to get a read on her during their first meeting.

She appears to be an airheaded and silly girl, but can be fiercely competent, loyal, determined and dangerous. This is especially shown through her relationships with Takuji and Zakuro. Kimika's assistance and her slowly growing loyalty and dedication towards helping Takuji's plans succeed was one of the biggest factors in his successful manipulation of almost the entire student body, Senagawa Yui and Kiyokawa Asumi. Likewise, in the Kimika Ending of Looking-glass Insects, Kimika's active fight against the bullies for Zakuro's sake is a huge reason why they manage to make it unscathed until Tomosane rescues them.

Kimika is also very smart, sly and cunning. She's a genius at chemistry and skilled at making dangerous chemical weapons. She can also be very manipulative, as shown when she suggests ideas to Takuji to keep his cult under control with the use of drugs and sex.

However, underneath everything she holds severe survivors guilt, trauma and anger due to Zakuro's suicide. Zakuro's unconditionally forgiving attitude towards her and how she ended up replacing Kimika as Megu and Satoko's main bullying target hurts Kimika deeply, making her feel as though Zakuro never treated her as an equal and guilty and responsible for Zakuro's suicide. Back when Zakuro was alive, Kimika treated her coldly, attempting to push her away due to this. At the end, it's implied she finds some solace from her success at punishing the bullies and Senagawa, and from her love for Takuji.

Plot
Kimika is first introduced in It's my Own Invention, as she approaches Takuji.