I'll Be Spoiled by My Big Sis Cousin?

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Authors: Igarashi kyouhei

Status:Ongoing

Genres: Ecchi Romance Comedy

Rating: 8.32/10 (26 votes)

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Summary

Masato Ooizumi just entered high school and he finds himself staying with a relative. Living there is his "big sister cousin" who's being way too close with him!? A slightly naughty, living together romcom begins under one roof!!

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Chapter List

First Chapter

Chapter 1

New Chapter

Chapter 25

Dec 08, 2025

Chapter 24 : Taking Care of my Onee-chan ♥︎ (Part 2)

Nov 21, 2025

Bonus Chapter : See-through ••• ♥︎

Nov 21, 2025

Chapter 23 : Taking Care of my Onee-chan ♥︎ (Part 1)

Oct 22, 2025

Chapter 22 : On my Way Home with the Class President ♥︎

Oct 22, 2025

Bonus Chapter : See-through ••• ♥︎

Oct 22, 2025

Oct 20, 2025

Oct 17, 2025

Oct 01, 2025

Sep 25, 2025

Sep 22, 2025

Jul 16, 2025

Jul 15, 2025

Jul 14, 2025

Jun 20, 2025

Chapter 16 : Class President in Trouble ♥︎

Oct 22, 2025

Jun 14, 2025

Jun 13, 2025

Jun 12, 2025

Jun 10, 2025

Jun 09, 2025

Jun 09, 2025

Feb 24, 2025

Feb 24, 2025

Jan 07, 2025

Jan 05, 2025

Sep 03, 2024

Aug 22, 2024

Aug 17, 2024

Jul 13, 2024

Chapter 3 : Extra : 3 Special Illustrations + Extra Pages

Oct 22, 2025

Chapter 2

Jul 07, 2024

Chapter 1

May 30, 2024

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I'll Be Spoiled by My Big Sis Cousin?

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