The Door into Summer (夏への扉 Natsu e no Tobira) is a 1975 Japanese manga by Keiko Takemiya. It is an early example of a shōnen-ai manga. It was originally serialized in Hana to Yume published by Hakusensha and it was re-released in 2000 by Kodansha. An animated film version of this manga was released on March 20 1981 in Japan.
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