Pai-Pai Rocket-Kun

The Pai-Pai Rocket-Kun is one of Lala's most bizarre inventions.

Feautures
It look like a pink rocket ship.

The original purpose was to increase the size of a woman's breasts by adjusting their hormone balance. However, drastically modifying the hormones and other systems of the individual, it can even completely change a boy into a girl.

Plot
The invention appear in the chapter 100 of To LOVE-Ru (adpated in OVA 1 of first anime).

After hearing Saruyama give a speech to Rito about men liking large breasts and interrogating her female friends on the question, Lala invented the Pai-Pai Rocket-Kun so it can give girls a ideal breast size and want to use it to please Rito. But Rito, attacked from Yami because of an embrassing situation, crash on the rocket that explode and he is turned into a beautiful girl (under the alias Riko).

After, in the chapter 103, Lala create the Cancel Ammo Launcher-Kun that revert the effects of the invention.

Trivia

 * The invention never reappear, replaced from the Koro Koro Danjo-Kun who has the similar effect to change sex for brief time.