Seifuku wo Matoeba, Umaku Uso ga Tsuketa no ni制服をまとえば、うまく嘘がつけたのに。 (Japanese); I can lie well if I put on my uniform. (English); Seifuku o Matoeba, Umaku Uso ga Tsuketa no ni.

From Exiled Rebels Scans: Sakuraba Souta has always been the best at everything, school, work, almost anything. This includes picking up the ladies. He claims he has the perfect life, except that his childhood friend Ukaji Tsumugu, can beat him at almost anything, making him Souta’s number one rival. That is until one of the women Souta plays around with decides she wants more. How will Souta get out of this situation? Will he do anything, even if it means begging his number one rival for help?