The main character "Kaburaki Ryo" used to live a wealthy life.
After the illness and death of his father, who had been engaged in business for many years in the "Republic of Kynesburg" which belongs to a small county in Western Europe.
His family was bankrupt and he was living a life of poverty while working part-time.
Then a mysterious maid "Sakura" appears in front of him.
"I need you to support my Lord's study in Japan."
The maid asks him to sign a contract as soon as he explains.
I mean, why I ......?
Although he is suspicious, he accepts the request because it is related to the Republic of Kynesburg, which his father is related to and above all, he is dazzled by the high salary.
On the day of the event, Ryo who was waiting for his arrival at the designated mansion on the outskirts of town, received a phone call from Sakura.
"Hi,hi,...... hi,eh,eh,is it at a mansion...... please come to the station right away."
She said.
Ryo unable to disobey his client's orders, rushes to the front of the station to see what's going on.
He has trouble with girls everywhere he goes, but when he finally meets up with Sakura, there are four sisters who are the source of his trouble.
It's like a "you're that guy" kind of reunion.
I mean, isn't that a lot......?
While these thoughts are running through his head, he is given a mission to take care of all four sisters, Flora, Anise, Sheryl and Aimee.
However, the true meaning of this study abroad program is......
The king, who was extremely indebted to Ryo's father's achievements in the Republic of Kaynesburg, wanted to invite Ryo to join the royal family.
So he decides to have all four sisters, his daughters, become Ryo's fiancées and to carry out a big matchmaking project in which the princess chosen by Ryo as his bride will be the first in line to the throne.
At first, the princesses looked unenthusiastic, but...
"So don't worry about the order or anything, just pick Amy, and she'll be the future queen."
"I don't know... but when you were making out with me earlier, your dick was really hard."
"I didn't say I didn't want to! If it's the fate of those born into the royal family, wow, I'm......"
"I'm sure my sisters and I feel the same way, and the rest is up to you, Ryo-sama."
And so began the "Matchmaking Project with the Sisters, the Princesses"...