Japan earned two consecutive penalty corners in the first half but Indian defenders thwarted both.
In the second half, the Japanese equalised in the 50th minute through a penalty corner. However, their happiness was shortlived as Gurvinder Singh Chandi scored a minute later to once again give India the lead.
India dominated the proceedings thereafter and finally finished the game through full-back Raghunath, who scored again via a penalty corner.
India will next face Oman Sunday.