They will seek a combined ¥400 million ($3.5 million) in damages, according to a source with knowledge of the suit. The site Cloudflare is accused of helping, by providing a server that can handle significant online traffic, has an estimated 300 million views a month and distributes about 4,000 manga titles, the source added. Piracy sites, where copies of graphic novels are distributed for free, have long tormented publishers of manga epics such as "One Piece" and "Attack on Titan," with losses estimated at millions of dollars in Japan alone. Cloudflare did not immediately respond to a request for comment, but it is not the first time it has come under fire from manga publishers.