The Metropolitan Police Department took action by conducting raids on various locations associated with the Tsubasa Party, focusing on allegations of violating the Public Offices Election Law. The party's candidate, Ryosuke Nemoto, along with party chief Atsuhiko Kurokawa and another campaigner, are under suspicion for allegedly interfering with other candidates' electoral activities during the by-election in Tokyo Constituency No. 15 held in April. The MPD escalated their investigation due to the continuous malicious acts that persisted even after warnings were issued in accordance with the law.

The investigators claim that the accused individuals resorted to disruptive tactics such as using a loudspeaker to drown out other candidates' speeches and chasing their campaign cars during the campaign period from April 16 to 27. These actions fall under the violation of Article 225 of the law, which prohibits obstructing candidates' speeches and physically assaulting them. If found guilty, the perpetrators could face imprisonment for up to four years or a fine of up to ¥1,000,000. Despite being warned by the MPD on April 18 for suspected violations, the individuals persisted in their disruptive behavior, justifying it as activities permitted by law for freedom of expression and political engagement.

The police raided the Tsubasa Party's headquarters in Chiyoda Ward, Tokyo, as well as the residence of party chief Kurokawa in Asaka, Saitama Prefecture, and the party's office in Nerima Ward, Tokyo. It was noted that the party had been recording their activities during the campaign, sharing them on social media platforms and video-sharing websites, possibly to garner attention with extreme content. The MPD expressed concern that these videos may have amplified the reach of their disruptive actions, potentially influencing public perception during the election process.