By ESPNSTAR.com staff
Kyoto Sanga teenager Yuya Kubo handed the Samurai Blue a comfortable lead at the break after netting a first-half brace, although Indonesia pulled one back two minutes the hour mark when Agung Supriyanto netted from the spot.
Nonetheless, Kubo put the Japanese back in control when he completed his hat-trick seven minutes later, before Ken Matsubara and Ryuga Suzuki weighed in with injury-time efforts to cap off an impressive win.
Japan remain two points ahead of second-placed Australia, who bounced back from Tuesday's disappointing draw with Singapore with a 3-0 triumph over Timor Leste, who are still searching for their first points of the campaign.
Luke Anthony O'Dea opened the scoring for the Australians five minutes before the break, before Adelaide United midfielder Jake Barker-Daish grabbed two goals in the final three minutes of the game to add some gloss to the scoreline.
Finally, Singapore kept alive their hopes of automatic qualification by comfortably beating Macau 3-0.
Courts Young Lions playmaker Faris Ramli opened the scoring in the 27th minute, before captain Al-Qaasimy Rahman doubled their lead five minutes later when he bombed forward and found the back of the net.
Midfielder Aqhari Abdullah then wrapped up the victory by grabbing a third in the 84th minute.
Thursday's AFC U-22 Asian Cup Qualifying Results
Singapore 3-0 Macau
Timor Leste 0-3 Australia
Japan 5-1 Indonesia