TVアニメ『転生したら第七王子だったので、気ままに魔術を極めます』エンディング主題歌を担当！ 表題曲「ハッピーの秘訣」はブラスを取り入れたモータウン系の楽曲。 作品のイメージに沿いながらも、作詞家・森雪之丞さんが見抜いた熊田茜音の性格が歌詞に落とし込まれた内容に。 常人には思いつかないユニークな歌詞は必聴！さらに、カップリングは「Take My Chance（feat. 樋口楓）」のソロバージョンと 転スラ日記オープニング主題歌のアレンジ「Brand new diary（R・O・N Remix）」を収録。
収録内容
01. Happy no Hiketsu (ハッピーの秘訣)
02. Take my chance
03. Brand new diary (R・O・N mix)
04. Happy no Hiketsu (Instrumental)
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