Kono S wo, Mi Yo

Rin Usuda is a troubled young man. He has a problem with his ass. Or rather, the funky birthmark on his ass. You see, his childhood friend Makoto Ikaruga used to tease him about it, leaving a deep-seated trauma that will cause him to barf on the possibility of baring his ass. Yes, Rin will even barf on the prospect of baring it to other guys, which is quite a problem in Japan since bath-houses and onsen are entered in the nude.

Another problem is that Rin has a massive crush on Chizuru Izumiya, a relative of his. He even frequents the hospital she is working in, if only to have late night coffee. Some nurses have even knew the boy.

Will this impasse bounce back-and-forth throughout the story? Hell no.

Kono S wo, Mi Yo (This S, See It!) is a manga written by Taku Kitazaki, and published by Shogakukan.

Tropes:

 * Blackmail: Takako used the "sex tape" kind on Kei Kurou and Mio Abiru. Of course, Rin is in on it too.
 * Blessed with Suck: Rin.
 * Chick Magnet: Rin, if he ever bared his ass in front of many women.
 * Cool Big Sis: Chizuru. Chizuru's fiancee fits the mold well, too...until he is revealed to be a
 * Christmas Cake: Chizuru's 30 and still single. She's soon to be married though... well, things get complicated with Rin around.
 * A Date with Rosie Palms:
 * First Love: Chizuru is always in Rin's mind ever since he was young
 * Green-Eyed Monster: Chizuru. When Makoto texted her that Rin got a girlfriend in a flashback, something inside her broke. Cue Chizuru's green eyed monster unleashed.
 * Hospital Hottie: Chizuru, Ayumi Kamon and Lisa Tokiwa.
 * I Didn't Mean to Turn You On:
 * Interrupted Suicide: When Lisa Tokiwa wants to commit suicide by jumping off the hospital building (with only Takako desperately holding on to her), Takako tells Rin that he must use his stigma in order to save her. Having no choice, he shows it to her and thus claiming another victim to the stigma.
 * May-December Romance: There are lots of Rin/Chizuru hints.
 * Manipulative Bitch: Takako Washio. She used Rin's birthmark to increase her social standings.
 * Parental Issues:
 * Patient Childhood Love Interest: Makoto.
 * Porn with Plot: Arguably heavier on the plot side.
 * Power Tattoo: Rin's birthmark is a tad too elaborate not to think of as this.
 * Shout-Out: AKS 74.
 * Tall, Dark and Bishoujo: Kei Kurou. Well, until she saw Rin's birthmark that is.
 * Teen Idol: Mio Abiru.
 * The Vamp: Takako is fast heading down this road, although she did this by proxy.
 * Woman Scorned: Chizuru's mother became this when she caught her husband having sex with another woman in her own house. Complete with a Kubrick Stare.
 * Woman Scorned: Chizuru's mother became this when she caught her husband having sex with another woman in her own house. Complete with a Kubrick Stare.