fine, i'll do it myself:

import matplotlib.pyplot as plt
from matplotlib.ticker import (MultipleLocator, AutoMinorLocator)
import csv
import math

y_star = [0]
y_ancient = [0]
x = [0]
with open('./output/1-plant-125-casks-448-days-1-sim.csv', mode='r') as file:
    reader = csv.reader(file, delimiter=',')
    for day, ancient, star in reader:
        x.append(int(day))
        y_ancient.append(int(ancient))
        y_star.append(int(star))

_, ax = plt.subplots()
ax.plot(x, y_ancient)
ax.plot(x, y_star)

ax.set(xlabel='days since initial planting', ylabel='profit (g)',
       title='Ancient Fruit vs Star Fruit profits')
ax.grid()
ax.xaxis.set_major_locator(MultipleLocator(112))
ax.xaxis.set_minor_locator(MultipleLocator(28))

ax.yaxis.set_major_locator(MultipleLocator(math.floor(max(y_ancient) / 10)))

plt.show()