At the pre-school KOUTO, we do the comings and goings that use identification card for high security. By this, we prevent an easy approach of the third person from the outside and secure safety. Even if someone will break open a door forcibly, it has the durability that cannot open by human power. For one with a card, comings and goings are very simple. Like ICOCA and SUICA used in JR, you put a card on a sensor and can remove a lock.