It's about Obon.

It's a smiling custom for ancestors who died during Obon to return home, but it's not an idea originally in Buddhism. Please look up “Obon” and “Obon” on Wikipedia. It's written in an easy-to-understand manner.

Next, if you end your current life, you will be reborn into the next one, so “the other world” is the world after being reborn as your next life. It's easy to understand if you know Reincarnation. Since they are living in different beings, it can be said that they don't come back from the other world only during the Obon season. That's because they're doing something somewhere.

In the Jodo Shinshu sect, people who died earlier become Buddhas and always lead us to our lost existence, so we don't come to the “other world,” and we don't think that they only get time during Obon and go back home.

Again, humans don't just live by logic. There is meaning in the tribe of people who are happy when their ancestors return home during the Obon festival, welcome them, and send them back again. It's something I want to cherish.

Nice to meet you, Mr. Matsunaka.
If you're a teenager, are you probably a student?

> During Obon, ancestors come back and spend time with their descendants, right
> If I pass away and it's Obon day, will I come back and spend time with my descendants?
Yes. That's right.

> Also, will they spend the rest of their lives forever after they pass away?
Yes. That's right. However, please be aware that each person has different interpretations of “the afterlife.” The “afterlife” I refer to is the world of the Buddha. Buddha is a person who has left reincarnation and gained enlightenment of liberation. I'm sorry it's a bit difficult. In other words, the Buddha does not reincarnate.

We humans live in a cloth woven by the vertical thread of our ancestors and descendants and the horizontal thread of our friends, companions, and neighbors. Obon is a time when those vertical threads go back and forth. The warp thread on cloth is a thread that cannot be seen on the surface, but as you know, it is an indispensable thing. Please spend your time feeling the vertical strings strongly during this time of Obon.

PostScript
If you were asked a question like this, maybe you have concerns that aren't written in the question text? Please don't hesitate to ask.

In Buddhism, we think based on reincarnation.
You too must have been a different creature before you became you, and the descendants you left behind at that time may still be there somewhere.
If you're 15, it's probably some kind of creature that died somewhere 16 years ago.
Let's say you were an American grandfather 16 years ago, and your grandson from that time is still in America today.
If that's the case, do you think your soul or spirit only goes to see your grandchildren in America during Obon?
Did you actually leave the astral body during Obon?
That's not normal.
Welcoming ancestors during Obon and making a memorial service is just a ceremony, and people who actually have become different creatures don't only return during Obon.
If your previous life was a fish, would you have gone back to the ocean this year for Obon?
That wasn't the case, was it?
So, as soon as we pass away, we are born as different creatures, and when we die, we are born again, and over again.
We don't stay in the same place (this world or the next) the whole time.
However, if your worries go away and you realize it, you won't have to go through reincarnation over and over again.
If you realize it, you either immediately begin to perish, or become a Buddha and do activities to save various living things.