「お兄ちゃん！今日だけエッチな事教えてあげる！」ヤリマンの妹がボク専属のエッチ専門家庭教師に！？ネガティブ過ぎる童貞のボクには、明るくて優しいヤリマンの妹がいます。このままずっと童貞で何も良い事なんてない、と落ち込んでいると、そんなボクを見かねた妹から…
"Brother! Just For Today, I'm Going To Teach You Naughty Things!" My Slutty Little Sister Is My Very Own Private Sex Tutor!? I'm A Pessimistic Cherry Boy And I Have A Slutty Little Sister Who Is Cheerful And Kind. I Was Feeling Down, Thinking About How I Was Going To Be A Cherry Boy Forever And My Little Sister Couldn't Stand To See Me Like That Anymore, So...
