Shin Koihime†Eiyuutan 1 2 3+PLUS ~Otome Enran☆Sangokushi Engi~ (真・恋姫†英雄譚 1 2 3+PLUS ～乙女艶乱☆三国志演義～) is a tetralogy of Japanese adult visual novels developed and published by BaseSon, and a part of the Koihime†Musou series, specifically entries in the Shin Koihime†Eiyuutan subseries.
Each game focusing on a different kingdom. Each game contains 3 episodes focusing on a different heroine from the kingdom.
Shin Koihime†Eiyuutan 1 ~Otome Enran☆Sangokushi Engi [Shoku]~, released in April 24, 2015, focuses on the Shoku heroines, namely, Aisha, Sui, and Sei.
Shin Koihime†Eiyuutan 3 ~Otome Enran☆Sangokushi Engi [Go]~, released on October 30, 2015, focuses on the Go heroines, namely, Renfa, Shishun, and Sai.
An all-in-one package version, Shin Koihime†Eiyuutan 1 2 3+PLUS, was released on July 29, 2016, containing all three games of the trilogy, a bonus disc Shin Koihime†Eiyuutan PLUS ~Otome Enran☆Sangokushi Engi~ featuring Mii, Yue, Ei, and En'ya, and a Soundtrack Disc.
Unlike previous installments, these games generally do not have a combat system involved, and are essentially a collection of short novels focusing on a different set of heroines at a time. After seeing the prologue of the game, you are brought into a story selection screen, where you can choose which story you wish to read.