Apparently the author of this Manga was inspired by the Quintessential Quintuplets and made his own version of it. Looks a little familiar. People does say it has similar vibes to TQQ.

The Quintessential Quintuplets Manga Author Wants to Try A Different Genre for His Next Work

The Quintessential Quintuplets Movie Key Visual : r/anime

Another version of the Quintessential Quintuplets? Can anyone explain or translate the title? Suppose to be very similar : r/5ToubunNoHanayome

The Quintessential Quintuplets Lives Up To Its Name - I drink and watch anime

Fuutarou was planning to quit tutoring and end relations with the quints, but Nino's confession made him want to stay : r/5ToubunNoHanayome

Quintessential Quintuplets Vs We Never Learn: How Changing Thematic Focus Goes a Long Way – Jay's Review Corner

10 Manga Like The Quintessential Quintuplets

The Quintessential Quintuplets (Manga) - TV Tropes

More Life-Sized Quintessential Quintuplets Are Ready to Be Taken Home for Around US$1,500 Each - Crunchyroll News

A better look at the quints of that other version of the blonde Quintessential Quintuplets. Looks very familiar. The Itsuki one is very obvious. : r/5ToubunNoHanayome

What is an anime/manga that started great but was ruined by the ending? - Quora

More Life-Sized Quintessential Quintuplets Are Ready to Be Taken Home for Around US$1,500 Each - Crunchyroll News

The Quintessential Quintuplets / Characters - TV Tropes

What is an anime/manga that started great but was ruined by the ending? - Quora