本剧改编自内田春菊的漫画，将原作中的男女主身份逆转，讲述了千代美和南是从小像兄妹一样生活着的青梅竹马，然而有天，千代美喜欢同时憧憬的恋人南，突然变成了15厘米的手掌大小——陷入了意想不到的事态的两人，今后会谱写出怎样的爱情故事呢…

Chiyomi Horikiri (Ai Iinuma) is a warm hearted high school student. She is a member of her school's basketball team. She stays bright even in a bit complicated family composition. Her boyfriend is Hiroyuki Minami (Yusei Yagi). One day, Hiroyuki Minami suddenly shrinks in size to only 15 cm. in height. He can easily fit in the palm of someone's hand. He appears in front of his girlfriend Chiyomi Horikiri.

1994年、2004年と2度にわたり映像化されてきた内田春菊の人気コミック「南くんの恋人」を、男女逆転バーションでドラマ化。ある日突然恋人が15センチの手のひらサイズになってしまう、甘くほろ苦いホーム・ラブコメディー。主人公のちよみを飯沼愛、ちよみの恋人で手のひらサイズになってしまう南くんをFANTASTICS・八木勇征が演じる。

쇼난 바다와 가까운 상점가에 사는 치요미는 소꿉친구이자 농구계 스타인 미나미를 좋아한다. 어느 날, 치요미는 미나미와 약속한 장소로 향하지만, 아무리 기다려도 그가 나타나지 않는다.