This story starts with Mamoru remembering the leaving of his childhood friend, when he was giving him a rose and the little boy promised that, someday, he will do something for him and he will return with lots of flowers. His friend dissapears and Mamoru started to cry, but from the sky, the voice of his friend can be heard, telling that he will come back.
Mamoru remembers this when he watches forget-me-not (Myosotis) flowers with Usagi. One of the symbols of forget-me-not flower is “true love”. While Usaghi is waiting a kiss from Mamoru, Chibiusa and all the girls are spying on them behind the flowers, Chibiusa becoming very jealouse.

But Mamoru notices something is wrong and lets Usaghi waiting for the kiss. Chibiusa grabbed the nearest leaf to her with a caterpillar on the bottom. Snickering quietly, she inched up to Usaghi… closer… and closer… giggling and scaring her.
Mamoru felt something and he went out from that place. Then as it started snowing with rose petals, the sky became dark.
His friend from childhood returned with lots of flowers. Usagi told him that Mamoru is her boyfriend and that guy hurt her. The name of that boy is Fiore.

At the news the girls found out that, in the afternoon, an asteroid was discovered to be fast approaching Earth’s orbit. It’ll be closest to the Earth around noon in the next day. But the closest distance to the Earth about 25 million kilometers, so there’ll be no direct effect on the Earth ifself. Those who own telescopes may wish to watch it that means that this is the meteor that Artemis mentioned.

Mako ask:
- It’s all right if it doesn’t collide with the Earth, right?
- That’s what we thought… Luna said
- There’s a problem? Minako asks
- Everyone take a look at this! Artemis said, pointing something at the computer. This is my own little analysis of that asteroid. It’s about 600 meters in diameter.
- That’s pretty large, Amy shouted. If it crashed into the Earth, there would be terrible consequences.
- No, we’re fine about that. Despite its size, the meteor is far less dense that expected. as such, it would burn up in the atmosphere, Artemis explained.
- Then, what’s the problem? Rei ask.
- We sensed plant energy from this asteriod, Luna said.
Meanwhile, Usaghi was thinking at Mamoru and his friend. And Minako is wondering id the guy they met at the botanical garden was an acquaintance of Mamoru’s. Usaghi knows next to nothing of Mamoru’s past. Usaghi was remembering that Mamoru lived all alone, because his parrents died when he was a little boy. But now he is no longer alone, Usaghi becomed his family and he feels like he was waiting all to meet Usaghi.
A strange plant grouwn in the night from a seed that came from the sky.

In the morning, the girls are going to school, and Usaghi as usual is sleepy, saying that is very hard to be a student and a soldier.

Rey stoped because she felt a strange aura. They all run to the place where the aura comes, but they discovered a lot of fainted people because all their energy was taken away. Suddnely all people arise, but all their faces looked like they were possesed. The fault is from some plants that are around them. Plants controls humans! But Rey with her mandalas saved that humans from plants.
Ami discovered the source of that evil plants. Is that flower that grew a night before.
That flower transformed in an deamon and started attack Chibiusa, but Usaghi saved her. Ami and Rey got hit by that “flower” , but Sailor Venus and Jupiter saved them.
Now is Sailor Moon’s round to fight with them (Chibiusa thank Usaghi for helping her). “A flower’s life is a short one… Maidens, your life may be short, so find romance! I won’t allow something to do evil while dressed as an elegant flower! For love and justice! A pretty soldier in a sailor suit! Sailor moon! I punish you in the name of the moon! Now all the Sailors are together to fight with this powerfull enemy.
They won this fight, but the one that was behind – Fiore with a Kisenian flower who likes the energy of Earth’s inhabitans. Fiore thinks that this planet will make his flowers bloom beautiful.
They started attack sailor soldiers, but tuxedo mask appear saving them. “Beautiful flowers turn ugly when grown with a filthy soul! That’s as far as you go, Fiore”. Fiore recognize him as Mamoru telling him that he didn’t forget the friendship between them.
- Fiore, why are you doing this? tuxedo mask ask
- Why? Why are YOU seeking solace from your loneliness with a dull dirl like this? She’s going to deceive you soon anyway and you’ll end up all alone!
-Please, Fiore. If you believe that our friendship is true, them believe in her and the people on her planet.
- I understand.
The flower from his chest is giving him powers to attack Sailor Moon, but Mamoru saved her. Fiore believes that Usaghi is fooling Mamoru. Mamoru is taken by Fiore.
Mamoru remembered about Fiore, and that memory was trus, that it wasn’t an illusion. Mamoru found Fiore, when he was little, and took care Fiore, but he has to live earth because his body couldn’t live for a long time on Earth. Then, Fiore left,and on a planet found a Kisenian flower, and decided that all human must die because they left Mamoru all alone. But Fiore is controlled by that flower, that is an evil one what tries to drain the energy from multiple planets. It is the most dangerous organism in this universe. This plant was found long time ago in the Moon Kingdom. The Kisenian is a plant that can’t do anything by itself. So it needs a human that will serve as its hands and feet. Kisenias are supposedlu known for attacking themselves to human with weak hearts. Once attached, the human will change their weakness into hatred and develop an evil power.
The sailor soldiers decided protect earth and Mamoru so decided to teleport to that asteroid, because they discovered that that is the place were are hiding Fiore and Mamoru.
The girls arrived on that asteriod, and they are welcame by Fiore, telling them that all the flowers will send their seeds to the earth, and all it will be full of kisenian flowers killing all humans.
The fight started to be hard for our girls. Fiore caught four sailor soldiers without Sailor Moon and he is blackmail her to leave her powerfull weapon, and her friends will live.
All girls remembered that they all were in the same situation like Fiore, but Usaghi was the only person that aproach all of them instead of all saying about each other. (Amy – the hard student that was a lonely girl, Mako – the violent girl, Minako – a girl pretending that is sailor V, Rey – psihic girl problem).
But Fiore want to kill Usaghi, but Mamoru save her, threwing a rose into his chest. In this moment, all flowers dissapear.
Usaghi is getting up, starting using the power of Silver Crystal, because is the only way for everyone to survive. But Fiore catch her Silver Cristal, but Usaghi is taking her hand, and remember to Fiore that Mamoru received that flower from Usaghi who was the first person near Mamoru as a big sister. After all Sailor moon is a flower. Moon princess wakes up and with the help of her friends saved earth. But finally the Silver Crystal crashed, and Usaghi dies, but Fiore came and give her a flower that has powers to heal(with all his energy). So Usaghi wakes up after Mamoru’s kiss and all the girls are happy that all is a happy end.
After all. Good and good persons always wins.