Unmei No Karada To Wakaretai. - Omoida Shitaku Na Katta, Moto Kare To No Zubuzubu H summary:

Living a content life as an ordinary office lady, Aoi finds herself reminiscing about a past flame—a former boyfriend with whom she shared an undeniable chemistry so intense they had to break up to avoid becoming consumed by their passion. However, things change when a new employee joins the company, and it's none other than her former boyfriend! Witnessing him effortlessly charming other women, Aoi is reminded of his playboy reputation and resolves to keep her distance. Yet, fate has other plans. That evening, Aoi's current boyfriend unexpectedly requests have a talk?! And as if her world isn't already turned upside down, she later finds herself face to face with her ex, he exclaims with confidence, "It turns out I am your soulmate, after all." Will she succumb to his intoxicating touch?!