The raw dialogue (roughly translated by fans) suggests Haruka makes a deal with the doctor: "Take my lifespan. Put it into her clover." The doctor laughs, revealing that human-to-Clover Bearer transfers have a 99% failure rate, turning the donor into a vegetable.
If you're a fan of slice-of-life adventures, character-driven stories, or simply looking for a manga that will put a smile on your face, then Kimi wa Yotsuba no Clover is an excellent choice. KIMI WA YOTSUBA NO CLOVER - chap 31 Raw Manga - WeloveManga