年上お姉さんと、イケない関係に…? コスプレイベントに参加する勇気が出ない高校生、三角。イベント会場でコソコソしていると、コスプレ愛が(異常に)強めの美女、コス姉さんに出会い…2人のレッスンの日々が始まる!? コスプレ知識も豊富に入った、コスプレ×ラブコメディ!! 2019年7月刊
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