The Spiral Heart Moon Rod Appears Before Endymion and Princess Serenity

Usagi is unable to transform into Sailor Moon after the daimon Mikuuji damages her brooch causing the ginzuishou to lose its power. When a new daimon, Nekonneru, threatens Usagi, Tuxedo Mask valiantly protects her by blocking her from any attacks and he orders her to get away. Usagi becomes emotional and tells Tuxedo Mask she wants to stay with everyone and help fight. She then takes Tuxedo Mask's hands in her own, raising them up in the air and they bow their heads in concentration. The daimon tries to attack again but she is easily repelled by a ball of energy surrounding Usagi's and Tuxedo Mask's hands. The scene around them changes into the Silver Millennium and they transform into Endymion and Princess Serenity. A bright ball of energy floats down from above and settles between Endymion and Serenity, where it starts to shine very brightly. Endymion and Serenity look on in astonishment as the Spiral Heart Moon Rod appears before them.
Sailor Moon S Episode #91
The birth of a rod of love! Usagi's new transformation
Ai no rod tanjou! Usagi no shinhenshin