The Leaves of Oak are a weapon carried by Super Sailor Jupiter in the manga, granted to her by Guardian Jupiter so she can unleash her Jupiter Oak Evolution attack during the Dream arc.
During the Dream arc, Guardian Jupiter bestows the Leaves of Oak upon Super Sailor Jupiter. The item exists only within the manga continuity.
Jupiter relies on the leaves to power her signature technique, Jupiter Oak Evolution. Like the fresh armaments handed to the other Inner Super Sailor Senshi around the same time, they carry a consciousness all their own and can reach Jupiter's mind through telepathy.

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The Leaves of Oak are a weapon carried by Super Sailor Jupiter in the manga. Guardian Jupiter grants them to her during the Dream arc.
Super Sailor Jupiter relies on the Leaves of Oak to unleash her signature technique, Jupiter Oak Evolution.
No, the Leaves of Oak exist only in the manga continuity. The anime has Super Sailor Jupiter channel Jupiter Oak Evolution through her tiara instead.
Guardian Jupiter grants the Leaves of Oak to Super Sailor Jupiter during the Dream arc, alongside similar new armaments handed to the other Inner Super Sailor Senshi.
Yes, like the other Inner Super Sailor Senshi's new weapons introduced around the same time, the Leaves of Oak carry a consciousness of their own and can reach Sailor Jupiter's mind through telepathy.
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