Adrena Flower

Adrena Flower is a flower with five pink-colored petals which Momo uses for invoking the Principal excited, as the flower has an opposite effect to Philosopher's Flower.

It apparently smells towards a person to acquire adrenaline for excitement as its name implies.

Plot
It appears in the chapter 4 of To Love-Ru Darkness and in the episode 3 of To Love-Ru Darkness, as Momo uses this flower for making the Principal excited thus he goes after Rito and Yui.