Koishi Komeiji's Heart-Throbbing Adventure (ConceptTopic, 6)
From Compile Worlds
Koishi Komeiji's Heart-Throbbing Adventure (古明地こいしのドキドキ大冒険 Komeiji Koishi no Dokidoki Daibouken) is a series of videos beginning with Koishi trying to obtain a fishing rod, and somehow escalating into the greatest and goriest slaughter Gensokyo has ever seen. It's sometimes nicknamed KoKo's Bizarre Adventure.
Somehow, TV Tropes ended up with two pages about this series – one with the Japanese title under Fanfic, and the other with the English title under Web Video.
Just remember, always carry a fishing rod in case of emergency.
Episodes
As of time of writing, 16 episodes have been released, 13 of which are available in English.