Mayonaka no X Giten

is a Japanese manga series written by Mikoto Yamaguchi and illustrated by BAREISHO. The manga was serialized in the Dengeki Maoh magazine and published in Japan by ASCII Media Works under the Dengeki Comics NEXT imprint from December 2014.

Synopsis
Kamiya Hiroki always thought women had it easy.

This thought was throttled by the fact that his 24-year-old sister does not work and plays games all day. Why couldn't he have it this easy? He wanted to become a woman and be lazy like his sister.

After blogging about his rants about his sister online, a mysterious reader comments on his blog, stating that there are ways to swap bodies with others. This would bring Hiroki's dream of becoming a woman to reality. Unfortunately for Hiroki, swapping bodies had unintended consequences when he returned to his own body.

(Source: MangaHelpers)