Touhou 7 ~ Perfect Cherry Blossom.

Taken from moriyashrine.com

Somebody's somehow collecting springtime energy from Gensokyo (unbeknownst to our heroines, the purpose is to revive a giant sakura tree). This is making things unseasonably cold in Gensokyo - it feels like winter! However, when the girls go to investigate, they discover that the hidden objective behind this tree's revival may threaten Gensokyo even more than the chill already in effect...

Unique Gameplay Mechanics
Cherry Points
In this game, you can collect springtime energy, which is measured in Cherry Points.
Killing enemies while unfocused will get you more Cherry Points than if you're focused, but you can also collect Cherry Point Items to make the process go faster.
Supernatural Border
If your CP reaches +50,000, the collected energy activates a Supernatural Border.
This border protects you from one hit until your Cherry value reaches 0 again; at that point, whether you ended up needing it or not, it disappears.
If you take a hit with a border up, it will wipe out all onscreen bullets.
If you don't take damage with your border up, you're awarded a sizable Border Bonus for managing to keep your border until its natural expiration.