How to restart the gas to get hot water (for Blue Apt)

In Japan, whenever earthquake happens, some gas meters stop and need to be restarted.
The following is guide for re-start the gas for the Blue Apt, but can be applied to any JP apts.

Step 1. Turn off all water in the apt (or any equipment uses gas).

Step 2. Go outside and near the bike parking, there should be 6 of the following gas meters (Each belong to each room).
The most left one belongs to your apt.

Step 3. Remove the rubber cover (if there is one) and press the button until you see frequent red blinks (about after pressing for 10sec?).

Step 4. When this red blink starts, stop pressing and wait for 2-3 min.
During the red blinks, the gas  system is checking if there is any gas leak or not throughout the room.
When the red blink stops, go back to the room & turn on the hot water.
Wait for a few min until there is hot water.