Gyakushu no Ore x Yome

The protagonist is a 35-year-old, unimpressive office worker, Fujisawa Katsuya (藤沢克矢). At his company, there is a junior colleague with the same name but different kanji, Fujisawa Katsuya (富士澤勝也), an extremely handsome heir to a wealthy family who is promiscuous with women. One day, Katsuya (克矢) tries to protect a female employee who is about to be taken home by force by Katsuya (勝也). After a fight, he falls into a river, and his mind is swapped with Katsuya's (勝也), who fell with him... Katsuya (克矢) ends up living with Katsuya's (勝也) wife, Reiko, who is still a virgin. (Source: Natalie, translated)

A man who's still a virgin, has a very very rare disease that only allows him to have sex 7 times in his life. After he's used up all 7 of the chances, he'll never be able to have an erection and ejaculate, which means he will lose his ability to have sex for the rest of his life. So far, he has wasted 2 times while masturbating, so he's left with only 5 more chance to have sex. He has to save those precious bullets, but at the same time he desperately want to lose his virginity. **Included one-shot:** Volume 4: Senpai no Kanojo to Heya de

"Progressive Rejuvenation Syndrome." This is an extremely rare disease causing the inflicted person to gradually become younger. The main character of this story, Munenori Agawa, is the only person that could save Rena Amami from this odd disease. Agawa's saliva is the only thing that can halt the disease from making Rena younger, so they must kiss everyday in order for her to survive. This causes an immense amount of conflict and drama between Agawa and his new girlfriend, Sayako Asou. This triangle relationship story tests the capabilities and limitations of human love. (Source: Gantz Waitingroom) **Included one-shots:** Volume 9: Nijidama Punch Volume 10: Psychic Duo Volume 11: Nijidama Bonbon