Premieres in theaters in Japan September 20th. The new PV is here. Check out the ANN article for additional information. Synopsis of the source manga from AniList:

One day, a poor high school second-year named Futaro Uesugi comes across a private tutoring gig with good pay. But his pupils are his classmates!! And they’re quintuplets!! A-and they’re all gorgeous girls, but they’re also troublemakers who hate to study and are on the verge of flunking out! And his first task is simply gaining the sisters’ trust?! Every day is a party! The curtain is rising on the Nakano quintuplets’ quirky romantic comedy with five times the cute!!