- Hyper Weapon (ハイパー兵器, Haipa- Heiki?) is a term Kyousuke once used to refer to his reproductive organ, in a joking context.
Trivia
- In the Rance series of eroge, the protagonist Rance is famous for referring to his own reproductive organ. The latest game in the series, Sengoku Rance, featured a heroine Princess Kou who is a "little sister" character.