Anayasa

Your kindness can change the world.

日本語

Drag to turn · scroll to zoom · click a country to see what happened

Building the world…

Happinessout of 10

Near you–

Japan –

World–

Day: 0
People reachedReached: 0
Acts today: 0
Countries(incl. Japan): 0

Anayasa · Your kindness can change the world.

How far can one small act of kindness travel?

You live somewhere in Japan. One kindness to someone close to you passes from person to person, crosses the sea, and may find its way back to the people around you.
Let’s see how far it spreads in two months.

How to play

Answer two questionsHow often you are kind, and how much of the kindness you receive you pass on.
Be kind to someone closeChoose one of the people around you for your first act of kindness.
WatchWhen kindness crosses the sea or comes back around to someone near you, a story card tells you.
Share the storyThe path your kindness took becomes a single image.

How it works

How to play

Two questionsHow many times a week you are kind (0–14), and what share of the kindness you receive you pass on (0–200%). Above 100%, you pass it to more people than you got it from.
Your first actChoose one of the people around you (different each time) for your first act of kindness.
WatchDrag the globe to turn it; scroll or pinch to zoom. “Show Japan” holds the view on Japan, and “See how it spread” shows when kindness reached the people around you, Japan and the world. Tap a country or prefecture to read the chain of kindness there.
ShareAt the end you can save a share image and copy a share text.

The model

Each person in the simulation stands for about 10,000 real people. Numbers follow the population of each country and prefecture.
Everyone meets three people a day. Someone who has received kindness passes it on at the rate you chose. With the same likelihood they also take up a habit of kindness, and from then on are kind of their own accord as many times a week as you chose.
Kindness mostly goes to people you meet every day (about 85–95%). Now and then it reaches someone in a neighboring prefecture or country (about 12% in Japan), and very rarely someone far away, through a business visitor, a donation or an online connection (about 0.1% per act). So crossing the sea is not easy. Kindness given straight back to the person who gave it counts as thanks, not as the chain going on (the chain goes on when it is passed to someone else).
About 0.3% of people in high-income countries and regions (Japan included) are connected with someone in a low- or lower-middle-income country through donations, fundraising, fair trade, or school and medical supplies (country groups follow the World Bank income classification). These ties are also a way for kindness to spread further.
In the first week, the people around you mostly meet each other.
The numbers of people and days and how easily kindness crosses borders are hypothetical settings chosen to make a story worth following. This is not a forecast of the real world.
Happiness starts from each country’s score in the World Happiness Report 2026 (countries not in the report start at 5.5 and are left out of the ranking). For prefectures, Japan’s score is adjusted by each prefecture’s difference in “happiness” (0–10, prefecture means) in the Japanese Digital Agency’s Regional Well-Being Indicators survey for 2026 (Japan as a whole keeps its own score). The people around you start from random values.
How much happiness rises (+1.0 for the giver and +0.6 for the receiver, adding up gradually, slowly fading when nothing happens, at most +1.2 points per person) is a hypothetical setting for the experience. It reflects the direction of research findings that kindness can lift the happiness of the giver as well as the receiver; the numbers themselves are not backed by research.
The stories from each place are fiction written with AI. They are not real people or events.
To improve the page we count only how many times it was played, watched to the end or saved (we do not record who played or what they chose).

A video that inspired it

Kindness that comes back around A short film in which one small kindness passes from the people who saw or received it to the next person, and finally returns to the first. It inspired the way this page shows kindness coming back to the people around you.
Life Vest Inside, “Kindness Boomerang - "One Day"” (YouTube) youtube.com/watch?v=nwAYpLVyeFU

Happiness data

Countries Scores from the World Happiness Report 2026 (life evaluation, 0–10, three-year average for 2023–2025).
Prefectures “Happiness” in the 2026 national survey (subjective data) of the Japanese Digital Agency’s Regional Well-Being Indicators: the mean answer to “How happy are you now?” on a 0–10 scale (whole prefecture, simple mean of respondents). It is an online survey, so the values are not weighted to each prefecture’s population.
Conducted by the Smart City Institute Japan, published July 2026. well-being.digital.go.jp/dashboard

The research behind it

What research mainly supports:

People who have just received kindness or cooperation are a little kinder to the next person. But the effect shrinks with each person it passes through and tends to fade over time.
Being kind raises happiness a little (small to moderate effects).
People tend to underestimate how much their kindness means to the person who receives it.

In this simulation, kindness passed on without fading, a lasting habit of kindness, passing on more than you received (over 100%) and the size of the happiness gains are not findings from research. They are hypothetical settings for experiencing “what if everyone were like this”. Research also reports situations in which unkindness or greed spreads more easily than kindness.

Last updated: November 13, 2026