Four suspects were believed to have filmed and shared videos in a group chat, while three others were found to possess similar materials.
The arrests took place between November and March.
All suspects have confessed to the charges, according to Chukyo TV.
Under Japanese law, anyone engaging in sexual intercourse with females under 13 faces at least five years in prison. Additionally, producing, supplying, or possessing child pornography is punishable by up to three years in prison or a fine of 3 million yen (US$20,000).
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