As Japan prepares to celebrate Valentine's Day, a cranky group of Marxist protesters have called for an end to public displays of love, claiming it hurts their feelings.

Members of 'Kakuhido', or the Revolutionary Alliance of Men that Women find Unattractive, unfurled a giant "Smash Valentine's Day" banner as the party-poopers set off to try and overthrow the annual celebration of romance.

The grumpy comrades elicited curious looks from passers-by in the trendy Shibuya district where they rallied against commercialism and chanted other buzz-kill slogans such as "public smooching is terrorism!"

"Our aim is to crush this love capitalism," the group's public relations chief Takayuki Akimoto told AFP.

"People like us who don't seek value in love are being oppressed by society," he added. "It's a conspiracy by people who think unattractive guys are inferior, or losers -- like cuddling in public, it makes us feel bad. It's unforgivable."

Previously, the killjoy group has also protested against "housewives who control Japan's future" as their hapless husbands work all hours at the office.

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