It's not bad, but it almost tells too much of the story. Not quite, but almost.
A lot of people have made that mistake, myself included. Try making the first line a hook, like...
For my murder story, the first line was "The day of the first kill would be anything but forgettable."
For my Doomsday Chronicles Series, the books always begin with some variant of a sentence beginning with "On the dawn of the holocaust..."
Granted, those were the first lines of the books, not the synopsis, but still. The hook rule still applies to summaries.
For the meat of the summary, you wanna make it more theatrical and less 'telling' if that makes sense. You can tell some of the story, but in a short and exciting way like how a movie trailer would deliver the synopsis of a new movie coming to theaters.
Hang on... I'll post my synopsis of Doomsday by Design here;
Could it happen? Skeptics and conspirators clash at every turn. Some deny the possibility of a global war while others swear by it as an inevitability... but the debate is over when the world stops turning. The bombs fall, millions die, and a deadly silence looms over the broken world after the damage is done. Perhaps Sandra's crazy, doomsday-prepping uncle was right all along. But now, her Uncle Dorian is missing in action. She'll have to brave the hazards of the apocalyptic wasteland if she ever hopes to see him again. Maybe she should've listened to all those stupid disaster-preparedness lectures after all.
See, I told some level of the story without giving away too much. You did well in that aspect, I think... it's just something you have to be extra mindful of. More so than that, I'd recommend just rewording a little bit, just to make it a smoother read. Like, the first couple sentences...
Not long after his mother's passing, Luca was offered to live with his aunt in the Capital. But there was a strange boy who’s also living with her. He wore weird clothes, never left his room, and never said more than one word.
This could read a little smoother, and it could give off a more mysterious vibe. Like...
Not long after his mother's passing, Luca agreed to live with his aunt in the Capital, unaware that a peculiar stranger now shared his aunt's home. The strange boy, an unsettlingly quiet recluse, never seemed to speak or leave his room--until the day Luca spots him sneaking out.
See, you can make it really theatrical if you word it properly. Hope this helped.