A seven minute epilogue to the TV series, released as an OVA.
AniWatch is the best site to watch Natsu-iro Kiseki: 15-kaime no Natsuyasumi SUB online, or you can even watch Natsu-iro Kiseki: 15-kaime no Natsuyasumi DUB in HD quality. You can also find Sunrise anime on AniWatch website.
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