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In Japan,late-night anime (深夜アニメ,shin'ya anime) refers toanime series broadcast on television during the night, usually between 10 p.m. and 4 a.m.JST.

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The earliest late-night anime titles includeSennin Buraku (1963–1964),Golgo 13 (1971),Lemon Angel (1987), andSuper Zugan [ja] (1992). Three of them were broadcast onFuji TV, whileGolgo 13 aired onTBS.Sennin Buraku was from the longest-running manga ever, originally serialised in the adult magazineWeekly Asahi Geinō from 1956 to 2014.Lemon Angel was a TV animespin-off of theHentaiOVACream Lemon and was based on the 80's J-popIdol group Lemon Angel.Super Zugan was from a manga aboutmahjong. Those titles received some attention, however, they remained as single experimental programs.

The title considered to be the true pioneer of late-night anime isThose Who Hunt Elves (1996) onTV Tokyo. At the time, several late-nightradio talk shows hosted by various voice actors were popular. As a genre, those programs were called "aniraji", the abbreviation ofanime andrajio (radio). TV producers thought that if anime-related radio programs late at night can be popular, then anime television programs on late night should work too. The results succeeded as they had hoped. Because of this, TV Tokyo continued its late-night timeslots. In 1997, the time slots were expanded, and they became the basis of the late-night anime that is known today. At the time, following the immense success ofNeon Genesis Evangelion, the number of anime productions rapidly increased, with many of those titles coming to late-night slots.Nippon TV also started their late-night anime withBerserk.

In 1998, Fuji TV restarted their late-night anime. At the same time,BS satellite stationWOWOW started their block with the complete version ofCowboy Bebop which had been incompletely broadcast in TV Tokyo's evening timeslot.

The first UHF late-night anime,Legend of Basara, started that year as well. However, the true rise of UHF anime came withComic Party (2001). In 2001, BS Digital stationBS-i began their time slot withMahoromatic, making the anime one of its holy grail contents.

In 2002, Fuji TV increased the number of programs that they broadcast. However, they did not value the otherwise filler programs with nearly zero ratings. As a result, the schedules of their late-night anime became extremely unstable. For instance, when a program was on the air at 2:25 A.M., it was on the air at 1:55 A.M the next week. The program would not broadcast the week after, and two episodes were shown at 3:05 A.M. in the following week. One such extreme case wasKanon, for which they broadcast the last three episodes in a marathon. Anime fans heavily criticized this attitude, and production companies began to avoid broadcasting on Fuji TV. Since then, the number of late-night anime has decreased, and it completely disappeared in October 2004. However, in April 2005, Fuji TV released a new anime programming block:noitaminA, aiming for ayoung adult female audience who otherwise would not watch anime. However, non-noitaminA anime, such asMushishi, still do not get a proper screening.

Late-night anime withadults as the target demographic has caused a rise in sales of anime shows to television stations in Japan in recent years. This type of anime is less popular outside Japan, being considered "more of a niche product."^[1]

Late-night anime broadcasts that are not part of the national network primarily air in the Three Major Metropolitan Areas (Kanto, Kinki, Chukyo) or the Five Major Metropolitan Areas (which include Hokkaido and Fukuoka Prefecture, as well as adjacent Saga Prefecture, where only one private station is present). In other regions, the history of late-night anime broadcasting is limited. This is often due to the composition of broadcasting stations being determined by the production committee's intentions. Outside of the target areas, stations purchase and broadcast programs through program sales. However, some broadcasting stations outside the Three Major and Five Major Metropolitan Areas actively air late-night anime, including content from independent stations. Additionally, if a work is set in a specific region of Japan, it may be broadcast as a one-time event on the local station of that region.

Since late-night anime is broadcast during non-peak hours (the standard overall viewership rate on weekdays is approximately 33% at midnight (about half of prime time), and around 12% at 2 AM.^[2]) around 2009, achieving a rating of 2.0% or higher was considered a "passing grade,"^[3] while 4.0% or higher was deemed "high viewership."^{[5][6][7][8][9]} In the 2020s, with the increasing popularity of internet streaming, ratings in the 2% range are also reported as indicative of high viewership.^[10]

Japanese TV stations do not have a clear detailed system ofparental guidelines.^[11] The only clear rule is that, except in the case of a pre-pubescent boy, they cannot show sexual organs. However, they do have many tacit understandings of self-restriction. Bare breasts, for example, are difficult to broadcast on prime time.

• Gad Guard (Fuji TV):

The production of the 7th episode (which corresponds to "EPISODE 8," including unaired episodes) faced delays and was not delivered to Fuji TV on the originally scheduled date of May 28, 2003, at 4:00 PM. In reality, it was delivered the following day at 12:35 AM. Consequently, the station decided to rerun the previous week's episode.^[12]

After broadcasting up to episode 20, the series faced atimeslot change due to the transition to a new broadcasting season and was subsequently canceled. Later, it was aired in its entirety on anime specialty channels such as Animax.

• Code Geass: Lelouch of the Rebellion (MBS, TBS):

Due to a tight production schedule, the main broadcast of the series was concluded after the 23rd episode. The remaining two episodes were broadcast approximately four months later in special programming.^[13]

A similar case occurred withEureka Seven AO, produced by the same network.^[14]

• Dances with the Dragons (TBS):

The series was initially scheduled to air on TBS and BS-TBS in October 2017,^[15] but on September 22, it was announced that the broadcast was postponed until April 2018 due to production-related reasons.^[16]

In response, TBS airedLove, Chunibyo & Other Delusions, while BS-TBS aired its second season, "Love, Chunibyo & Other Delusions -Heart Throb-," respectively.^[17] This series was aired as a late-night anime by independent stations, which TBS and BS-TBS marked its first broadcast.

• UHF anime

• Otaku O'Clock - a TV Tropes article discussing the matter
• NIPPON TV TO DISTRIBUTE ANIME ONLINE at activeAnime via theWayback Machine
• Sci Fi builds late-night anime block

• Anime and manga terminology
• Anime television
• Otaku

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