Ayakashi Triangle

Ayakashi Triangle is a Japanese manga series written and illustrated by Yabuki Kentarō. The story is set in the same world as To LOVE-Ru series or at least has its own version of several characters.

Plot
Ayakashi Triangle focuses on exorcist ninja Matsuri Kazamaki, as he tries to defend his childhood friend, the Ayakashi Medium Suzu Kanade, from evil spirits called ayakashi. However, during a battle to save Suzu's life, Matsuri is turned into a girl after being cursed by Shirogane, the King of Ayakashi.

With no apparent way to reverse the transformation, Matsuri is forced to live publicly as a girl in the foreseeable future as he and Suzu deal with both the friendly and the malicious ayakashi they encounter as well as their growing romantic feelings for each other, all while trying to break Matsuri's curse for him to return to his original masculine form.

General examples

 * Matsuri's favorite manga, Switch Onmyoji, is written by Yūki Saibai.
 * Run and Magical Kyouko have appeared on various in-universe media. And Matsuri's grandfather is a big fan of former.
 * Similarly to Yui, Shirogane use often the term "shameless" when a character show lustful intent that he disapproves.

Specific example

 * In the chapter 1, Matsuri's grandfather is reading a magazine with Run on the cover.
 * In the chapter 4, Matsuri's grandfather is watching a music video with Run on Tv. In his room there is also a poster of her.
 * In chapter 7, he again is watching another Run video but on PC.
 * In chapter 8, Shirogane tries to track down an ayakashi by smell, but ends up finding a cartoon standee of Magical Kyouko.
 * In chapter 10 Lu mention to be a fan of Yūki Saibai and she has all his manga.
 * Run appear again in chapter 23 on Matsuri's grandfather' PC.
 * In the chapter 30 Matome Ageru appear as fan of the ayakashi Garaku Utagawa.