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.

5-toubun no Hanayome (manga), 5Toubun no Hanayome Wiki

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

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

My collection (from left to right): Mini illustration book, volume 14, 13, nino and ichika character book : r/5ToubunNoHanayome

The Quintessential Quintuplets: Wide Ruled, Japanese Anime Notebook For Drawing, Writing, Painting, Sketching, Anime Lovers Gift Idea by Polly Williams

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

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

The Quintessential Quintuplets / Characters - TV Tropes

I need recommendations. I hope the effort gives a good idea of what I like. If my top 5 is like your top 5 let me know! : r/MyAnimeList

5-toubun no Hanayome (manga), 5Toubun no Hanayome Wiki

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

Manga Like The Quintessential Quintuplets

The Quintessential Quintuplets: Who I Wanted To Be The One & Who Ended Up The One - KMAC'S THOUGHTS, REVIEWS, & OPINIONS

The Quintessential Quintuplets (season 1) - Wikipedia

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