Natsumi is Hakase's granddaughter. She is 14 years old. She often treats Kakeru like her little brother. Natsumi can be bossy at some times, but she can get lovey-dovey when Hiroki saved her life in Episode 36 of Season 2 from Pink Monkey. Natsumi can be terrible at cooking, which made Hakase and Kakeru puke.

An evil monkey, Specter, has escaped a circus, using a mind-controlling device which allows him to become smarter and have access to controlling the monkeys. Kakeru is called over by a professor in order to capture all the monkeys, including the one's who's controlling them: Specter.
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(Source: Anime News Network)

Tomoko Kawakami was a Japanese voice actress. Having graduated from the Toho Gakuen College of Drama and Music, she was affiliated with Production Baobab at the time of her death.

In August 2008, Kawakami was diagnosed with ovarian cancer, which required surgery. During a three-year battle with cancer, most of her ongoing roles were replaced by other voice actresses, although the latter was able to do some voice work until her retirement in the start of the 2010s decade. She died on June 9, 2011 at the age of 41.

The monkeys are up to no good again, but this time they're on the "heroes" side. Performing no good magic shows, cloning themselves with a ninja Jutsu and filling UFO catchers with themselves are just a few of the tricks they're pulling, while at the same time trying to adapt themselves to the human lifestyle.