There are two stories included.

In first one main character is a member of time patrol organization that chases time criminals. His mission is to protect future superior energy device developer company from time offenders. Company undergoes restructure times, so protagonists joins its baseball team to support them and keep surveillance at the same time.

In the second one main character is sent to debt forced labor facility "Happiness Island" operated by the mysterious organization "BB Team". He gets assigned to the baseball team, and thus needs to beat BB team and escape the factory.

[From vndbreview]