My entry into the otome genre started with a Bokujō Monogatari game.
When I was around 12, my dad bought Harvest Moon: Boy & Girl for the PSP. It was originally meant for my brother, but I ended up taking it over and promptly fell head over heels for Gray. That single crush sparked a whole new interest.
Eventually, I started hunting for any game that offered romance and marriage, which eventually led me to trying out dating sims games available online in English (which were mostly targeted for males, and there's gems I found at DeviantArt - Pacthesis' dating sims, Nummyz' dating sims) and discovering the wider world of otome (RE: Alistair from sakevisual, etc.).
As someone who was growing up loving games, YA romance novels, and shoujo/josei manga and anime, falling into the otome genre as a hopeless romantic was a match made in heaven. Bokujō Monogatari (/ Story of Seasons) series will always be where it all began for me.