NTT Communications Shining Arcs picked up their first win of the new Japan Rugby Top League season Friday thanks to a not-so-modern form of communication, some old fashioned brute force and some sublime handling.

The introduction of a mobile phone to the field to help referee Kyosuke Toda communicate with the TMO and a huge hit from Amanaki Lelei Mafi saw the Shining Arcs score two unanswered tries in the final 23 minutes as they beat Toshiba Brave Lupus 25-14 at Prince Chichibu Memorial Rugby Ground.

But it was the Shining Arcs' desire to run the ball at every opportunity and their ability to catch, hold onto and pass a slippery ball on a night when the heat index hit 42 C that really laid the seeds for the win.

"We asked the boys to show courage rather than be conservative," said NTT coach Rob Penney. "Some might look at it as being risque but at the end of the game we were still running and Toshiba had no legs."

In the second game of the doubleheader, Wallabies legend Matt Giteau bagged a brace of five-pointers -- his first tries in the Top League -- as Suntory Sungoliath were made to work hard to beat Ricoh Black Rams 31-15 in front of 10,218.

Kotaro Matsushima also touched down twice as the defending champions posted their second-straight bonus point win.

On a hot, muggy night in the nation's capital, NTT Comms showed their intent straight from the kickoff when they tried running the ball from deep.

But they only had a handful of opportunities in the opening half as Toshiba used their power game to earn the lion's share of possession and territory.

From a period of sustained pressure by the Toshiba pack, scrumhalf Takahiro Ogawa sneaked over in the 22nd minute and added the extras to his own try.

But the Shining Arcs were stretching the Brave Lupus defense and were finally rewarded for their adventurism and tenacity when Rahboni Warren-Vosayaco powered over in the 40th minute following some great work from Hayato Mitsui and Willie Britz.

Jumpei Ogura, who had kicked a penalty eight minutes earlier, added the conversion to make it 10-7 at the break.

Toshiba's power saw them regain the lead 10 minutes into the second stanza, when Keisuke Matsuda crossed the chalk following a powerful run by Michael Leitch.

But the game turned well and truly in NTT's favor seven minutes later, when Shokei Kin just had the legs to beat the defense after a number of Toshiba players were guilty of appealing to the referee rather than defending the blindside.

Toda was eventually persuaded to consult the TMO but with the officials comms system seemingly down, assistant referee Mayumi Takahashi, the first woman to officiate in a Top League game, had to bring on a mobile phone.

After communicating for what seemed like an eternity Toda allowed Kin's try to stand.

"NTT took their chances every time we made a mistake," rued Toshiba manager Tomohiro Segawa.

Ogura missed the conversion but added a penalty in the 63rd minute to stretch NTT's lead before Shane Gates sealed the win with a try in the 74th minute following a big hit by Mafi that worked the ball free and allowed the Shining Arcs to once again launch their exciting backs.

"Our skills coach (Toru) Kurihara-san has brought in some innovative skills activities that have enhanced the handling of all the players and it's paying dividends," Penney said.

"There was some sublime handling out there tonight from the tight forwards as well as from those you would expect to be good."