A Japanese cafe fired a waitress and accused her of mixing her blood into the cocktails she served

• A cafe in Japan fired a waitress and accused her of mixing blood into the cocktails she served.
• The cafe is known for its bad girl concept, where "dark girls" and "problem children" serve drinks.

A Japanese cafe has fired a waitress and accused her of mixing her blood into the cocktails she made.

The Mondaiji cafe in Sapporo, Hokkaido, said on Twitter that they fired one of their servers after she made customers a drink mixed with her blood. The drinks — called orikaku, or original cocktail — usually contain fruits or other colorful syrups.

"Such an act is no different from part-time job terrorism and is absolutely not acceptable," the cafe's tweet on April 2 read.

The store's owner added that the cafe — located in the Susukino entertainment district in Sapporo — was shut for a day to replace all the drinking glasses in-store. The cafe did not name the fired server.

The cafe's name loosely translates to the "Problem Child Concept Cafe." The cafe also advertises itself on Twitter as a space for dark girls and "problem children" who are also "the cutest" to serve their customers.

One of the specialties at the cafe is an all-you-can-drink menu, which goes for $19.

The cafe owner tweeted a statement apologizing to customers for the incident.

"Please let me continue the store a little longer so I can be happy alone. I'll clean the store, change glasses, and dispose of alcohol that may have been contaminated. Once again, I am very sorry to have caused you trouble this time," the tweet, posted on April 2, reads.

Japan is known for its concept cafes. In Tokyo, you can find a snake cafe, a ninja-themed entertainment restaurant, and a variety of maid and butler cafes in the city's famed Akihabara district.

However, some food establishments — like the conveyor belt sushi chain Sushiro — have faced issues with a trend called "sushi terrorism," per CNN. This was a spate of incidents where people would film viral videos of themselves contaminating communal soy sauce bottles and food meant for other customers.

Police arrested two diners, Ryu Shimazu, 35, and Toshihide Oka, 34, in early April. The authorities accused Shimazu and Oka of eating pickled ginger from the communal serving bowl with their chopsticks instead of using a serving utensil.

Representatives for the cafe did not immediately respond to Insider's request for comment.