Synopsis: Cupid's Prank: Rainbow Balls

Volume 4 of the manga series "Senpai no Kanojo to Heya de" delves into the intricate predicament of a man who is afflicted with a rare disease that permits him to engage in only 7 sexual encounters throughout his lifetime. In the event that he surpasses this limit, he will not be capable of becoming sexually aroused or experiencing ejaculation again, leaving him impotent for life. Regrettably, he has already depleted two opportunities via masturbation, leaving him with only five remaining chances. Despite his strong desire to lose his virginity, he must exercise caution and carefully conserve his remaining chances.