Grandfather Nirasaki is a farmer living in the rural countryside near the dilapidated house bought by Hana. He first appears when the realtor informs local farmers of Hana's arrival and again when she asks permission to use fallen leaves for fertilizer.

He initially presents as austere and authoritative, openly criticizing Hana's farming inexperience. He tells her she looks "like a fool" when smiling and declares her unfit for agricultural life. His sternness is clear when he digs up her potatoes, merely stating the soil is unprepared, and orders her to continue working despite her visible exhaustion. He responds to Hana's joking remark about an excess of potatoes with a scowl and drives away abruptly as she tries to thank him.

Beneath this exterior, he possesses a genuinely caring and patient nature. He secretly coordinates community assistance for Hana, showing concern for her well-being. His actions, including gifting her potato seedlings, are later revealed as deliberate efforts to support her self-sufficiency. His guidance proves crucial to Hana's eventual farming success.

Physically, he has short grey hair, a slim build, dark brown eyes, and fair skin. His typical expression is strict. For farm work, he wears a white shirt with an outstretched collar, grayish sweatpants, and a sun-protective hat.

His significance extends beyond agricultural mentorship, subtly influencing the community’s acceptance of Hana’s family. Unverified speculation suggests he might be connected to wildlife disturbances affecting other farms – specifically a boar ruining neighboring potato crops – to ensure reliance on Hana’s produce. His character embodies the theme that meaningful support can manifest through seemingly brusque methods, fostering resilience and integration.