Assertion: soman's group | /r/HasProperty | rumi okubo
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Source sentences:
text: The series' opening theme, "DeCIDE", is performed by the unit SUMMONERS 2+, a group composed of voice actresses Azumi Waki, Yū Serizawa, Yumi Hara, Rumi Okubo, and Emiri Katō, and the ending theme, "Saiaku na Hi demo Anata ga Suki.