Obtained: Talk to the Cafe Staff lady wearing a maid outfit standing along the windows of Cafe Seiren in Shibuya.
For this one, wait until you enter the DTV Idolasphere in Chapter 3. You will be able to get the 3 Maca Leaves off of enemies as you progress through this area. Once you obtained all three items, return to Cafe Staff to hand over the leaves.
Reward: Melmark and new menu item at Cafe Seiren: Herban Legends Tea