Tuklasin ang ぐるぐる流出音源集 (Gulu Gulu Ryuushutsu Ongen Shuu) [サイレン盤 (Siren Edition)] ni gulu gulu, inilabas noong 04/05/2020. Isang album na may 6 na kanta kabilang ang 'SE - サイレン盤- (-Siren Edition-)', '火炎瓶 (Kaenbin)', '汚れた豚 (Yogoreta Buta)'. Kumuha ng detalyadong streaming stats, pagsusuri kada kanta, at mga sukatan ng pakikilahok ng tagapakinig.
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