To reinforce our ideas, here are some research.

1.Human Brain Loves Surprises
Most people love surprises. Scientists at Emory University and Baylor College of Medicine may have discovered why some people actually crave the unexpected.

The brain finds unexpected pleasures more rewarding than expected ones, and it may have little to do with what people say they like. It responds more to unexpectedness.
Therefore, its like our "Gachapon" idea, people get to turn the knob for an unexpected gachapon. This gives them a surprise, and proberbly they would want to play more with it. Making it addictive!
Surprises makes people feel happy in a way too.



2. Happiness Comes Cheap
A bar of chocolate, a long soak in the bath, a snooze in the middle of the afternoon, a leisurely stroll in the park. These are the things that make us the most happy, according to new research from The University of Nottingham.

Its the simple things in life that truely makes people feel happy. Modern-day pressures take their toll on everyday happiness. As a result we try to make ourselves feel better and happier through personal rewards and treats. We’ve all heard the saying ‘a little bit of what you fancy does you good’, and treating yourself is the ideal way to keep spirits lifted when you’re down in the dumps.(acording to Dr Tunney )
It appears that spending time relaxing is the secret to a happy life.
Our main concepts targets on this.