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.

Catching All the Skipped Content from Episode 2 of Go-toubun no Hanayome ∬

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

Catching All the Skipped Content from Episode 8 of Go-toubun no Hanayome ∬

Anime, Entries From an Introvert

10 Manga Like The Quintessential Quintuplets

The Quintessential Quintuplets Movie Key Visual : r/anime

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

The Hidden Geekiness of Madara Uchiha. — least to most favorite quintuplet and why? also

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

Manga Like The Quintessential Quintuplets

What does he have in his pocket? He seems holding something from his childhood friend visiting's chapter and also in the ichika's side chapter : r/5ToubunNoHanayome

Moto Kizoku Reijou de Mikon no Haha Desu ga, Musume-tachi ga Kawaii Sugite Boukenshagyou mo Ku ni Narimasen (Light Novel) Manga

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

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