Japanese equities extended gains at the start of Friday's session, mirroring a modest uptick in U.S. equity-index futures as ongoing negotiations between the U.S. and Iran boosted market sentiment.
The Nikkei 225 gained 229.2 points or 0.4% to open higher at 61,913.36.
At home, Japan's core inflation slowed more than expected in April, rising 1.4% year-on-year, as government measures to lower living costs offset pressures from a weak yen and high energy prices.
On the geopolitical front, Iran said Washington's latest proposal partly bridged gaps, but the Supreme Leader's remarks on uranium stockpiles and a dispute over Hormuz tolls dimmed hopes for a swift breakthrough.
Tehran is discussing a permanent toll system with Oman to formalize control over Hormuz shipping, while President Donald Trump insists the strait must remain open and toll-free, and Iranian President Pezeshkian vowed not to back down in talks.