An increasing number of companies are starting unique leave programs aimed at improving employee morale.

Software developer Cybozu Inc., for example, allows employees to leave their jobs for up to six years to study abroad or take other sabbaticals, because it believes the program, introduced in May 2012, helps employees accumulate outside experience that can be used when they return.

Etsuko Nagayama, 28, will leave for Botswana in mid-January as a member of the Japan International Cooperation Agency's Japan Overseas Cooperation Volunteers.