Mr Ishiba has been under growing pressure to step down as his ruling Liberal Democratic Party (LDP) and its junior coalition partner, Komeito, lost their majority in the 248-member upper house, the smaller and less powerful of Japan's two-chamber parliament on Sunday, shaking his grip on power and Japan's political stability.

Japanese Prime Minister Shigeru Ishiba’s future is uncertain, but an unlikely campaign for him to stay was growing online this week, including from people who are his natural political opponents.

Japanese Prime Minister Shigeru Ishiba vowed to remain in office on Monday after his ruling coalition suffered a bruising defeat in upper house elections, prompting some of his own party to deliberate his future as the opposition weighed a no-confidence motion.