Yotsuba ‘s the just cousin which allows Fuutarou since the a tutor from the very start 
Yotsuba phone calls Fuutarou “Uesugi-san.”  The girl first impression from Fuutarou try “individuals gloomy and you will does not have any of several household members”  and you may Fuutarou’s basic thoughts off Yotsuba is the fact she’s a simpleton. 
This was almost certainly on account of knowing and recalling him throughout the Kyoto excursion five-year just before. She cheerfully cooperates with him to manufacture this lady sisters accept your as the an excellent teacher. Because they spend more date along with her, Fuutarou reduced transform and you may discovers in order to comprehend most other areas of lifetime, such as having fun which is shown inside the shot out-of courage in the industry excursion, when he and you may Yotsuba scare individuals with her  in which he even produces from the his skills that have Yotsuba along with her sisters within the a journal, instance learning snowboarding regarding former. 
Fuutarou and you may Yotsuba find yourself going on a romantic date with her during Labour Thanksgiving Big date, mainly because Raiha shame-trigger the lady sibling towards the providing something special getting Yotsuba to settle her on her behalf let from inside the profession journey.  After planning five different places during the day symbolizing the fresh almost every other five sisters, Fuutarou discovers himself experiencing the big date the very first time whenever the guy and you can Yotsuba go to the girl favourite put – the newest park – as well as the only day he could be found chuckling from inside the pleasure was once they play on the swings together with her.  Fuutarou is additionally proven to be much more personally comfortable with Yotsuba compared to the almost every other quintuplets, as he frequently holds her ribbon when berating this lady and you may solutions them after; almost every other cases of the two getting touchy-feely include the big date when Fuutarou was not frightened to fund her lips along with his hand to cease their away from becoming heard by the tune class master Eba incase the guy holds the girl of the arms in the ferris controls when he will get an tip in the enhancing the quints’ studying activities. He discovers of a few regarding the lady early in the day products  which is calculated to assist this lady over to beat the woman trouble that have learning.
Following third season of higher-college starts, Yotsuba nominates Fuutarou become the course member to obtain some one to know just how great out of a guy Fuutarou is.  She concurrently declares that whoever Fuutarou increases to love, she will help your where like.  
After the fresh Dawn Event, Fuutarou showed that the guy cherished Yotsuba and you may despite this lady efforts to virtually run away regarding a future that have him, she in the long run admitted the girl a lot of time-hidden fascination with him, so you can Fuutarou’s surprise
It’s indicated that Yotsuba is the person who came across Fuutarou five years ahead of the story’s beginning  and you may invested every fateful big date having Fuutarou inside Kyoto, completing towards the two of her or him while making a vow to review burdensome for the people it love, Yotsuba’s mommy and Fuutarou’s sibling  .
The pair of them after continued several other big date in which Fuutarou got their to three locations important to him and additionally they at some point wound up during the park again, on account of Yotsuba’s pros so you can Fuutarou. Following the chain on Fuutarou’s swing bankrupt as he tried to jump off to conquer this lady range, he suggested so you’re able to this lady with a smile, she told him that it was a promise and then make the lady childhood desire to-be a bride-to-be be realized. 5 years after, Fuutarou married Yotsuba and just after their wedding, Yotsuba found to help you him one to she kissed your under the bell five years early in the day, that he blushes.  
Itsuki is the to begin the latest quintuplets you to definitely Fuutarou match and you can quickly got a disagreement having, best her to deny your once the sisters’ teacher in early stages. Because of Fuutarou’s uniform jobs, Itsuki started initially to see the transform on her behalf therefore the siblings.  Itsuki usually measures up the lady father in order to Fuutarou on account of the girl mom’s conditions.  She and you will Fuutarou develop per other’s reputation, as they both defeat the stubbornness.   She understands a lot more away from Fuutarou than this lady siblings, knowing their family’s financial situation that will be the initial that he uncovered element of their earlier in order to. Whenever Itsuki keeps a beneficial fall-out which have Nino because of Nino rejecting Fuutarou’s services, she remains on Fuutarou’s apartment on account of the lady sisters being unsure of in which it is and you will she had no place otherwise to visit. During the Scrambled Egg Arc, Itsuki is revealed feeling you to definitely its matchmaking is no longer regarding people, however, to that particular out of nearest and dearest. When Fuutarou acknowledged that it, she is thrilled and you may quickly ran to your combined shower he was a student in to join him, are embarrassed when she understood just what she is creating.