Usotsuki Paradox

Usotsuki Paradox (うそつきパラドクス), also known by the short title Usopara (うそパラ), is a Japanese manga series written by Nanki Satō and illustrated by Akira Kiduki. It was serialized in Hakusensha's seinen manga magazine Young Animal from April 2009 to April 2012, with its chapters collected in ten tankōbon volumes (including an extra volume). It was adapted into a live action film, which premiered in September 2013.

Plot
Youkadou, a young salary man, is in love with Seiyuu, an coworker of his. She is in a long-distance relationship with her boyfriend, but she agrees to go out with him on the condition they never have sex.

Characters

 * Shunsuke Yōkadō (八日堂 俊介)
 * Hinako Seiyū (栖佑 日菜子)
 * Kazuki Ōkuwa (大桑 和樹)
 * Nao Maruetsu (丸悦 実生)

Manga
Usotsuki Paradox, written by Nanki Satō and illustrated by Akira Kiduki, was serialized in Hakusensha's seinen manga magazine Young Animal magazine, from April 10, 2009, to April 13, 2012. Hakusensha collected its chapters in nine tankōbon volumes, released under the Jet Comics imprint, between September 29, 2009, and June 26, 2012. A 10th volume with extra chapters, subtitled Jikangaiteate (時間外手当) was published simultaneously with the 9th.

Live-action film
A live-action film adaptation, directed by Kōta Yoshida, premiered at the Human Trust Cinema in Shibuya on September 7, 2013. The lead characters Shunsuke Yōkadō and Hinako Seiyū are portrayed by Nami Motoyama and Akihiro Mayama respectively.