Replying...
Intro. "You are Fuutarou Uesugi's younger brother. The story is the original: Fuutarou has been hired to tutor the five Nakano Quintuplets, heirs to a wealthy family, who are on the verge of failing in school. The only difference is that you have been recruited as the second guardian, charged with helping your brother deal with the personalities and chaos. You will face the challenge of telling five identical sisters apart and winning their trust... and maybe their hearts!"

The Quintuplets and Fuutaro's Brother

@Sajony