On November 17, Japanese Prime Minister Shinzo Abe became the first world leader to meet US President-elect Donald Trump  in person, at Trump Tower in New York. Various commentators noted that Abe's rush to meet with the President-elect was in part due to the need to address numerous complaints Trump had raised regarding Japan  during the campaign. In Japan, commentators questioned the content of the discussion and exactly why Trump's family members were allowed to sit in on a meeting between two heads of state.
— PM's Office of Japan (@JPN_PMO) November 18, 2016 
Initially, very little was known about the hastily arranged meeting between Abe and Trump. Following the ninety-minute meeting, news reports relied on photos and a statement by Abe provided by the Japanese Cabinet Office  to glean what was said and who attended.
— 日経LIVE (@nikkeilive) November 17, 2016 
The American media is also reporting that Prime Minister Abe is President-elect Trump's first meeting with a foreign head of state. — Nikkei LIVE
Prime Minister Abe said in his statement :
I cannot answer questions about the specifics of the meeting. In any case, our alliance will not function without trust. I came away convinced that President-elect Trump is a leader who can be trusted.
The November 17 meeting occurred at Trump's private residence in Manhatten, and featured an assortment of characters, whose presence was viewed as controversial. Among these were Trump's daughter Ivanka and her husband Jared Kushner , and Mike Flynn, who served as the director of the Defense Intelligence Agency and who would be appointed as new US national security advisor  in Trump's preliminary cabinet the day after the meeting.
Critical for Japan to Have Good Relations With “Dangerous” Trump Administration
The meeting appeared cordial, and Prime Minister Abe reportedly gave Trump a made-in-Japan golf club worth $5,000 . From Japan's perspective, it was imperative that the meeting be a success. Blogger, PhD candidate  and Japan commentator Robert Fahey says  a Trump administration is “dangerous” for Japan, and notes:
Donald Trump’s stated positions on foreign policy are a significant threat to that relationship. Trump’s statements throughout his campaign paint Japan not as a partner but as a global rival of the United States. He suspects Japan of currency manipulation to the detriment of the US […] [Trump] has also repeatedly railed against what he views as the United States being short-changed in its security arrangements with Japan, and has gone far beyond the US establishment – which has long pressured Japan to take a more proactive role in conflicts and peacekeeping efforts – by suggesting that Japan should arm itself with nuclear weapons to ensure its own security.
In the wake of Trump's Japan-bashing  during the US election, commentator and former Japanese legislative aide Tobias Harris suggests Prime Minister Abe was also likely also trying to reassure Japan that the special relationship with the United States will continue:
When Abe says he can trust Trump he's trying to reassure Japanese people, majority who see Trump's win as bad & bad for US-Japan rel. https://t.co/hUVW6Gx2O4 
— Tobias Harris (@observingjapan) November 18, 2016 
It was not lost on some Japanese netizens that, based on body language, Abe seems to have a much better relationship with Trump than with Chinese President Xi Jingping:
この落差に笑ったw pic.twitter.com/69PGqKwxaR 
— KAZUYA (@kazuyahkd) November 18, 2016 
Abe + Trump = *smiley face*
Abe + Xi = *meh*
The total difference here makes me laugh, lol.
Concerns In Japan About Abe's Rush to Meet Trump
Not everyone in Japan is reassured by Abe's meeting with Trump, however. Writing for Yahoo! Japan News , popular writer and activist Shiba Rei  notes that, although Prime Minister Shinzo Abe was one of the first world leaders and other notables to contact Trump on November 9 following his victory, so was French far-right leader Marine La Pen:
必読です。→ 安倍トランプ会談で世界にさらした恥―ドイツ・メルケル首相が見せた格の違い(志葉玲) – Y!ニュース https://t.co/yAKQu8t4E2 
— Miko Yoshimura (@minekoyoshimura) November 18, 2016 
Must read: Abe a world-class embarrassment after his meeting with Trump. ― Shiba Rei reports on Abe's completely different response to Trump compared to Germany's Angela Merkel.
Rei also wrote that while Abe called Trump “trustworthy”, German Chancellor Angela Merkel indirectly indicated significant doubts  about Trump's commitment to the very principles of liberal democracy.
Japanese opposition leader Renho Murata  also blasted Abe, complaining that the details of what was discussed in the meeting were not disclosed. Sankei News reported  that Renho demanded to know if strategic issues such as the Trans-Pacific Partnership and the future of American bases in Japan were included in the talks between Abe and Trump:
— 渡邉哲也 (@daitojimari) November 18, 2016 
“I came away convinced that President-elect Trump is a leader who can be trusted.” (Abe and Trump meet)
Democratic Party (Japan) leader Renho asks, “On what basis do you trust Trump? You have an obligation to explain why.”
For other Japanese observers, perhaps the biggest question was why Ivanka Trump attended the meeting between Abe and Trump. Trump's daughter has no formal role in the US government, and is preparing to take over her father's business empire .
Sankei Biz asked:
— SankeiBiz (@SankeiBiz_jp) November 18, 2016 
Why did Ivanka Trump sit-in on the Trump-Abe meeting? Her presence stood out.
The next day, the US press had one possible explanation:
— Philip Rucker (@PhilipRucker) November 19, 2016