Kii

Kii’s height, weight, bust, waist, and hip measurements are all unknown.

Her bust size exceeds 100 centimeters at its largest, making it famously impressive even among monster girls.

Her leafy appearance can become more lush in warm climates or humid conditions, such as after visiting an onsen.

She has an overall delicate look but is capable of growing to giant size under certain conditions.

Kii is highly distrustful of humans due to her traumatic experience of being abducted and separated from her kind.

She is known to be difficult, often only showing friendliness toward Papi, Suu, and Tionishia.

She tends to ignore most other people, with Kimihito Kurusu barely escaping her indifference at times.

Kii’s mood can be quite moody and prickly, especially around strangers.

Kii’s birthday is May 4th, placing her under the sign Taurus.

Unlike other exchange students, she was not part of any official exchange and was instead smuggled into Japan by humans.

She became weak and lost in the forest after being separated from her companions, where Papi stumbled across her and decided to plant her, helping her take root.

Her name "Kii" was given by Papi, inspired by the word "tree."

She currently lives in the forest due to her status as an undocumented entrant, and Kuroko Smith has allowed her to remain there instead of being deported.

Kii’s original homeland is unknown, but clues suggest it is a region warmer than Japan.

Kii can absorb nutrients from her surroundings, including liquids that may cause her size to increase drastically.

She possesses a unique ability to secrete nutrients and fluids similar to breast milk.

Her plant physiology enables her to survive by taking root and absorbing what she needs from the earth.

However, absorbing artificial nutrients or chemicals can cause dramatic changes in her size or temperament.

She shares a close bond with Papi and Suu, the ones she trusts most in the human world.

Kii’s relationship with Kimihito Kurusu is complicated but slowly improving thanks to repeated kind gestures.

She regards other members of the circle, such as Centorea Shianus and Tionishia, with cautious curiosity but is slow to truly open up to them.

She is somewhat jealous and suspicious, especially over anyone who gets close to Kimihito Kurusu in a manner similar to how she has been treated.

Kii’s ability to secrete milk-like nutrients often results in comical situations where people end up drinking directly from her bust.

She was once suspected of sending threatening letters because of her species name, much like Draco.

Despite her legal status as an undocumented immigrant, she chooses not to return to her homeland, preferring her new life in the Japanese forest.

After an incident with nutrient absorption and subsequent giant transformation, she allowed herself to be “milked” until she shrank back to normal.

"Don’t trust humans... but maybe, just maybe, there are a few exceptions."

"Trees grow strongest where sunlight and friends reach them most."

Arrival in Japan

Kii was brought to Japan against her will after being kidnapped by humans, a traumatic experience that established her deep distrust of people.

Life in the Forest and First Encounter with Papi

Weakened and alone, she was found by Papi, who helped her to take root in the local forest and unwittingly named her.

The Incident with the Nutrient Solution

Kii accidentally absorbed nutrients dumped illegally in the forest, causing her to grow to a monstrous size and briefly lose control, putting Kimihito Kurusu in danger.

With help from the others, the excess nutrients were drained from her, causing her to return to normal size.

Afterward, she was suspected alongside Draco due to misunderstandings about the sender of threatening letters.

Gradual Integration

Though still wary of humans, Kii slowly warms up to Kimihito Kurusu, Papi, and Suu, appreciating their kindness and growing more comfortable with her forest home.

Kii’s origin remains mysterious, but it’s speculated she comes from a region far warmer than Japan.

Her unique needs and nature as a dryad set her apart from other exchange students.

Despite her legal and emotional challenges, Kii continues to grow as a person—and as a plant—in her new surroundings.