Shirobuta Kizoku Desu Ga Zense No Kioku Ga Haeta Node Hiyoko Na Otouto Sodatemasu Manga Raw Chap 181 Raw Manga Welovemanga -

(also known as Reincarnated as a Neglected Noble: Raising My Baby Brother With Memories From My Past Life), the "chapter 18.1" or "181" raw manga mentioned in your query appears to be a specific release currently listed on aggregation sites like WeloveManga. Series Overview

The Conflict: Ageha regains memories of his past life and realizes his younger half-brother, Regulus, is destined to kill him for the family title in the future. (also known as Reincarnated as a Neglected Noble:

For those who are new to the series, Shirobuta Kizoku Desu Ga Zense No Kioku Ga Haeta Node Hiyoko Na Otouto Sodatemasu, or "I'm a White Pig Noble but I Recall the Memories of My Previous Life, so I'll Raise My Younger Brother" in English, is a Japanese manga series written and illustrated by Kaito. The story follows the life of a young noble named Shiro, who is reincarnated into a new world with memories of his past life. The Conflict : Ageha regains memories of his