Kimizuka Kimihiko is a crisis-magnet. So it is no surprise when his rather mundane flight suddenly enters a state of emergency with a dire need of a detective onboard. Unfortunately, his attempt at avoiding trouble is foiled by a beautiful girl with silver hair who goes by the codename Siesta. Declaring herself a detective, she unceremoniously drags Kimizuka into the case as her assistant. That incident spelled the beginning of an adventure around the globe that went beyond his wildest imagination. Putting their lives on the line, the two took down criminal organizations, prevented disasters, and saved thousands. But the curtain closed to their epic journey with Siesta's untimely death three years later. Resolving to live an ordinary high school life this time, Kimizuka spends a year maintaining a low profile. However, as fate would have it, a girl with an uncanny resemblance to Siesta comes crashing into his life, threatening to throw his peaceful days into disarray.
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| Directing | Manabu Kurihara | Series Director |
| Sound | Mary | Theme Song Performance |
| Sound | Nanakagura | Theme Song Performance |
| Writing | Deko Akao | Series Composition |
| Writing | Nigojū | Novel |
| Art | Minoru Ookouchi | Art Designer |
| Art | Minoru Ookouchi | Art Direction |
| Sound | Nobuyuki Abe | Sound Director |
| Directing | Shinichi Fukumoto | Assistant Director |
| Editing | Rina Oguchi | Editor |
| Visual Effects | Yosuke Ito | Character Designer |
| Sound | Kyohei Akezuma | Sound Effects |
| Sound | Jun'ichirou Suzuki | Sound Effects |
| Sound | Naoki Tani | Original Music Composer |
| Sound | Tatsuya Yano | Original Music Composer |
| Sound | Yuuyu | Original Music Composer |
| Visual Effects | Yosuke Ito | Supervising Animation Director |
| Production | Hajime Maruyama | Producer |
| Production | Kousuke Arai | Producer |
| Production | Sojiro Arimizu | Producer |
| Production | Fumihiko Shinozaki | Executive Producer |
| Visual Effects | Eiko Nishi | Color Designer |
| Camera | Kouhei Hon'ami | Director of Photography |
| Production | Sou Yurugi | Executive Producer |