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The “Flower” and “Lamp” are the same thing, it’s a lamp shaped like a purple flower. It’s located in room 202 of the Sunrays Apartment. When you turn it on, a small “Rai-Onna” appears above the flower-shaped lamp. This is the key to completing the Thunder Sisters quest.

You follow the usual procedure to receive the quest, and once you talk to Ryoko in apartment 201, she’ll tell you that you need to do, leave and re-enter the contract until the “Rai-Onna” appears as the ghost you need to catch on the Sunrays Apartment contract. Capture the ghost as usual, and then the older sister will appear, roaming throughout the apartments.

To attract her, you need to turn on the lamp in room 202. When she enters the room and goes near the lamp, use the special rope to stun her. Then, simply leave and re-enter again, and you will have the quest completed along with the animation.