Touhou Luna Nights - Thousand Dagger abuse in Boss Rush (Rank S time 3.18.35)

Just an example of how broken this skill is and how to efficiently use it and get super easy effortless S rank.
This skill is cost efficient for MP/Time, high DPS and invincible (easy graze).
Here's an even better time done by someone else.
• Touhou Luna Nights(동방 ...