Looking for a Specific Manga

So, I have been looking for a digital manga for a week. I found it on mangadex but I forgot the name. I just want to find it again.

The most I can remember about the manga is :

• Isekai Manga

• Mc is depressed because his family in his past life died in a house fire

• Mc dies from overwork

• Mc reincarnates as a kid in an aristocratic family, but still depressed

• Mc's new family is worried for him so they decide to go on a picnic, but in this picnic a monster goes after his family.

• After they go through that ordeal, Mc wakes up finally and decides to live for his new family.

• Mc decides to learn magic with his brother, but his talent is less than his brother.

• Then the mc and his brother do synchronization magic, which was forbidden.

That's all I can remember, but at the time I read this manga it had less than 10 chapters