Many things begin in April.
For example,the train which I use every day to commute Tokyo got crowded
with the new recruits.
Every year new recruits of the year are assembled near Tokyo to educate
how to implement their work.

Japan Productivity Center For Socio-Economic Development classify the
recruits of this year into "cluster of curler "because of their tendency of their
thinking & behavior.
Details is written below.
http://activity.jpc-sed.or.jp/detail/lrw/activity000857.html

In May recruits will be sent each directions for on-the-job training,so that trains wil be not crowded.