A sequel, Hatoful Boyfriend: Holiday Star, was released on 29 December 2011, with an English version being released on Christmas Day the following year.In addition to the main games in the series, Hatoful Boyfriend has made transitions into other media: a monthly webcomic was serialized in the anthology Manga Life WIN , several supplementary materials and official dōjin works have been released, and four drama CDs based on the series have been made. A bird, Ryouta, flirting with the player in the original version (top) and the 2014 remake (bottom).There are thirteen (fourteen in the 2014 remake) endings in total: one ending for each of the main love interests, three extended endings for three of the love interests based on stat values, one ending for the gaiden-esque Torimi Café storyline, and one ending attained if the player fails to romance any character.When routes are completed, documents are unlocked that provide insights into the game's overarching storyline.
In Bad Boys Love, it is revealed that Hatoful is set in a post-apocalyptic, dystopian future—in which a pandemic of a deadly, mutated strain of the H5N1 virus, or bird flu, nearly wipes out mankind in the year 2068.
The release of a counter-virus, cultivated to destroy the virus' avian carriers in a desperate attempt to stop the spread of the disease, ends up backfiring as birds who resisted the counter-virus instead developed human-level intelligence.
Society has adjusted to the avian conquest, though with minor bird-related cultural changes—for example, while some holidays such as Christmas and Tanabata are celebrated much as they are in the present day, a major event in the game is Legumentine's Day, an amalgamation of the traditions of Valentine's Day and Setsubun.
These documents can be viewed at any time in the game's archive feature, which is accessed from the title screen.
After obtaining the four specific endings required to trigger it, the player is given a new prompt to either "fulfill the promise" or live "a normal life" upon starting a new game.