The Japanese phrase "Totemo tanoshikatta desu" in English is "[It] was very fun".
Japanese is the official language of Japan, which has a population of over 125m. Japanese uses 4 distinct systems of writing: kanji, hiragana, katakana and romanji.
Hiragana is syllabic and the most original writing system in Japan. It is used for simple words, conjugations, particles and children's literature as it is the first set of writing which is taught. Katakana is used to write foreign words. Kanji is based on the Chinese writing system and consists of about 2000 signs. Recently, romanji, a romanization of Japanese words - has developed, too.
Japanese uses 4 different ways of addressing people: kun, chan, san and sama. Kun is somewhat condescending, chan is used for intimates and children, san is the universal mode and sama is deferential.
Learn more facts about the Japanese language at Japanese Language.org.
Check out 6 Tips for Learning Japanese, shared by Discover Japan.