MIDE-817 Even though I had a girlfriend for the first time...I was eaten by the older sister who lived next door and lost my virginity Minami Hatsukawa

I summoned all my courage and confessed my feelings to my female classmate, a liberal arts student with excellent grades and a good personality. I couldn't believe it, but it wasn't until I got an OK response that I got a girlfriend! And yet... Minami, my childhood friend who lives next door and is one year older than me, suddenly changes! A virgin for her... No! I got a girlfriend! However, my first experience was at school...even though I had a girlfriend...with my childhood friend...