Editing Ryuho Okawa (section)

====Study group====
On 6 October 1986, Okawa opened the first office for Happy Science in [[Suginami]], Tokyo, with four staff members. Happy Science's initial name was {{Nihongo|Jinsei no Daigaku-in: Kofuku-no-Kagaku|人生の大学院 幸福の科学}} ("Happy Science, The Postgraduate School of Human Life"). The name "幸福の科学" originates from inspiration that Okawa said he received from Nichiren's spirit; the details were published in Okawa's first book ''Nichiren no reigen'' in 1985. At first, the organization disguised itself as a "study group on human happiness"<ref name=baffelli2007p86>{{Harvnb|Baffelli|2007|p=86}}</ref> and consisted of readers and sympathizers of Okawa's spiritual works, who were friends and acquaintances of Okawa.<ref name=fukui2004p68>{{Harvnb|Fukui|2004|p=68}}</ref><ref name=baffelli2007p86 /><ref name=leto2014p195>{{Harvnb|Leto|2014|p=195}}</ref> However, the organization may have intended to be known as a religious body later.<ref name=fukui2004pp68-69>{{Harvnb|Fukui|2004|pp=68–69}}</ref>

On 23 November 1986, Okawa gave his first sermon to about 80 followers in Tokyo. This date is now known as one of the most important dates in Happy Science's history. It is known as the day of {{Nihongo|Shoten-bōrin|初転法輪|Shoten-bōrin}} ("The First Turn of the Wheel of the Dharma").<ref name=fukui2004p69>{{Harvnb|Fukui|2004|p=69}}</ref>{{efn|The name refers to the day that the "Wheel of Law" ({{Nihongo|hōrin|法輪|hōrin}}) started to "turn for the first time" ({{Nihongo|shoten|初転|shoten}}). It is a Buddhist expression, where the "Law" refers to teachings, in this case those of Okawa. The "turn" refers to the introduction of the teachings to the world.<ref name=fukui2004p69 />}}

In March 1987, Okawa gave what is known as his first official large public lecture, entitled "The Principles of Happiness", to an audience of about 400 people. In the lecture, he implied that he was a prophet, saying that while spiritual mediums and psychics cannot hear the voice of God, prophets can.<ref name=fukui2004p70>{{Harvnb|Fukui|2004|p=70}}</ref>{{efn|Okawa may have thought of God as "High Divine Spirits" as well as the Creator God. Fukui (2004) says this is so because Okawa mentions Archangel Gabriel, who sent messages to Prophet Mohammed, and the spirit of Nichiren who spoke to him, both of which are known as high divine spirits.<ref name=fukui2004p70 />}} He said that a prophet's task is to listen to the voice and spread the word of God. He stated that the early years of Happy Science would consist of study.<ref name=fukui2004p70 /> 

In June 1987, a new series of books, called the {{Nihongo|"law"|法|hō}} series, launched.<ref name=winter2013pp427-428>{{Harvnb|Winter|2013|pp=427-428}}</ref> The first three books, {{Nihongo|''The Laws of the Sun''|太陽の法|Taiyō no hō}}, {{Nihongo|''The Golden Laws''|黄金の法|Ōgon no hō}}, and {{Nihongo|''The Laws of Eternity''|永遠の法|Eien no hō}}, published from June to October, may be seen as the fundamental doctrinal text of Happy Science.<ref name=winter2013p428>{{Harvnb|Winter|2013|p=428}}</ref> The three books are collectively called {{Nihongo|"The Trilogy of Salvation"|救世の三部作|Kyūsei no Sambu-saku}}.<ref name=fukui2004p102>{{Harvnb|Fukui|2004|p=102}}</ref> They were originally presented as the final revelations of the Buddha.<ref name=winter2013p428/> ''The Laws of the Sun'' is the first book in which Okawa explained his own point of view and his teachings. While Okawa had published books before, they were all spiritual messages that came from spirits, not Okawa. The book contains "the core of [Happy Science]'s doctrine" and is "the starting point of its salvation movement".<ref name=fukui2004p56>{{Nihongo|Fukui|2004|p=56}}</ref> The book also contains an account of Okawa's early life.<ref name=fukui2004p63/> ''The Golden Laws'' is dedicated to "time and history in relation to the Truth".<ref name=fukui2004p102/> ''The Laws of Eternity'' focuses on the structure of the spirit world, which ''The Laws of Sun'' also covers, but the book explains it in greater detail.<ref name=fukui2004p56/> Each book in the trilogy has a subtitle which mentions the ''shaka''. The subtitles would be changed in future editions following changes in Happy Science's doctrine.<ref name=winter2013p429/>

At the end of 1989, with the publication of ''The Rebirth of the Buddha'',{{efn|Originally {{Nihongo|''Buddha Saitan''|仏陀再誕|Budda saitan}}<ref name=fukui2004p72>{{Harvnb|Fukui|2004|pp=72}}</ref>}} Okawa officially claimed that he was an incarnation of Buddha and his is teachings were re-interpreted in light of this revelation. The doctrine of Happy Science was interpreted to be fundamentally Buddhist, according to his own followers.<ref name=winter2013p428/>

Okawa's audience at his lectures grew larger as Happy Science gained new members. The initial audience of 400 at his lecture in 1987 grew to 10,000 by 1990.<ref name=fukui2004p70 /> The organization grew rapidly. In December 1989, the headquarters was moved to one of the most expensive business buildings in Tokyo in [[Kioichō, Chiyoda, Tokyo|Kioichō, Chiyoda]], next to Tokyo's main business and political area. The rent was known to be ¥25 million per month.<ref name=fukui2004pp70-71>{{Harvnb|Fukui|2004|pp=70–71}}</ref>