Touhou Saikotan: Servants of Harvest Wish

A Touhou fangame created by the group Dream Compass.
The game features a "Harvest Mode" system where grazing rewards you with harvest items. These harvest items will put you into Harvest Mode after filling up your Harvest Gauge. In Harvest Mode, all point items and faith items on screen will be auto-collected. You will gain point item value for all harvest items obtained during Harvest Mode, as well as up to three spell pieces for collecting a sufficient amount of harvest items.

For an unknown reason, all of the crops in Gensokyo began to wither away. At this rate, the humans will starve very soon. Reimu Hakurei, Marisa Kirisame, Sanae Kochiya, and Ryouko set out to discover the cause of this incident, and put an end to it.