Monster Musume (manga) Volume 4

Monster Musume: Everyday Life with Monster Girls (モンスター娘のいる日常, Monster Musume no Iru Nichijou) Volume 4 is the fourth volume of the Monster Musume: Everyday Life with Monster Girls manga series. Containing four chapters and two bonus comics, this volume introduces Rachnera Arachnera into Kimihito Kurusu's household and the start of the "D Arc". Serialized in Monthly Comic Ryū magazine, the serialized chapters were collected and published in tankōbon volumes by Monthly Comic Ryū in Japan and later translated for an English release by Seven Seas Entertainment.

Volume four was released in Japan by Monthly Comic Ryū on the 13th November, 2013, and translated and released for English audiences by Seven Seas Entertainment on the 19th August, 2014.

Chapters

 * Chapter 15
 * Chapter 16
 * Chapter 17
 * Chapter 18

Trivia

 * Included in the volume was a "Secrets" page focusing on Polt's financial independence, a "Secrets" page focusing on Rachnera/Arachne and two bonus Omake; one about the girls trying on bras and one theorizing what it might be like if Papi had tail feathers.

http://www.crunchyroll.com/anime-news/2013/11/13/drunken-new-years-centaur-featured-with-monster-musume-release