Kyuni Anega Dekimashite!
Asami, a beautiful but mysterious girl appears before Ryosuke, the protagonist who is in his thirties, and claims that she is his sister. She is the sister of Ryosuke's brother's wife, in other words, she is somewhat Ryosuke's sister... Aiming to be the ideal older sister, she decides to engage in extreme big sisterly acts!
21 chapters
- Chapter 21 — I Suddenly Have An Older Sister!
- Chapter 20 — I Suddenly Got A Phone Call
- Chapter 19 — I Suddenly Have To Wear A Yukata!
- Chapter 18 — I'm Suddenly Going To An Onsen!
- Chapter 17 — I Suddenly Have To Stop Stripping
- Chapter 16 — I Suddenly Have To Take An Intensive Course
- Chapter 15 — Suddenly, a sibling battle broke out!
- Chapter 14 — Suddenly I Went to Pool
- Chapter 13 — Suddenly I Got Introduced
- Chapter 12 — Suddenly I Got Delivered
- Chapter 11 — Suddenly I Became a Home Tutor
- Chapter 10 — Suddenly I Got Nursed
- Chapter 9 — Suddenly I Got Called and Told to Pick Her Up
- Chapter 8 — Suddenly I Got Pressed for Answers
- Chapter 7 — Suddenly My Sister-in-Law Came to Visit
- Chapter 6 — Suddenly I'm Being Healed
- Chapter 5 — Suddenly I Became a Model
- Chapter 4 — Suddenly I Have a Little Sister
- Chapter 3 — Suddenly We Went on a Shopping Date Together
- Chapter 2 — Suddenly We Started Living Together
- Chapter 1