Wakate Ita Hazu (I should have known) is an insert song in the series. This is sung by no one but Akemi Satou, Composed by Chihou Kiyouka, and arranged by Mayabu Tsuchiya. It is used in episodes 10, 18, 28, 40, 43, 45, 47.
| Graph IRI | Count |
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| http://dbkwik.webdatacommons.org | 7 |
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