Police and a coroner have also urged parents to be vigilant amid growing concerns about the free-to-play game, which officials describe as a risk to children and young people, says the Manchester Evening News.
Players read the games story and are then prompted to create their own endings. Darren Walmsley, whose son Ben killed himself in February after playing the game, believes this feature played a part in his sons death.
It starts as a dating simulation before one of the girls dies, reports The Times. Other unsettling events then take place, including characters who self-harm or kill themselves, adds the paper.
Characters suggest things and you decide what to do. It drags you in and they make it very real. Ben did not speak about it, but parents need to be aware of this game and other similar games, said Walmsley, from Bury.
It is free to download but once you get into it, it will not leave you alone. The characters befriend and love you and give you tasks to do but if you do not do them, they turn nasty.
Is it linked to suicide?
Although there is no evidence to suggest the game is directly linked to Ben Walmsleys death, schools and councils have been alerted by the Manchester Coroners Office, which is investigating his death. Awareness messages are also being shared on Facebook.
The warning, signed by the senior coroner for North Manchester, says: I believe the information is so concerning that this warrants my writing at this stage to make the local authorities aware of the issue so appropriate information can be disseminated.
Bens school, Philips High in Whitefield, posted online: A concern has recently been brought to our attention by HM Senior Coroner regarding the use by young people of the online game Doki Doki, also known as Doki Doki Literature Club.
A concern has been expressed that the game may trigger suicidal thoughts in young people who may be emotionally vulnerable.
Please monitor and check your childs internet use regularly and be mindful of the time spent.