Brave soul, even braver heart (crossover harem x OP male oc)

Toad Rose is the adopted son of Summer Rose and Taiyang Xiao Long. He dreams of being a hero despite being born without power but his family still encouraged and support him. they even train him which made him even stronger and helped his sisters train. Things got even better when he attended union academy. One day he found an emerald crystal and picked it up and once he did, it started glowing and when the glowing dissipated, a girl in red appeared saying that he's her driver. During his time in union, he made some friends and he even got himself a harem. How will his family react when they find out that a bunch of girls has fallen in love with him?