C1: Kyouka Fuushi

Shunsuiken DMG is increased by 40% against opponents with 50% HP or less.

C2: World Source

Namisen's maximum stack count is increased to 5. When Kamisato Ayato has at least 3 Namisen stacks, his Max HP is increased by 50%.

C3: To Admire the Flowers

Increases the Level of Kamisato Art: Kyouka by 3.

C4: Endless Flow

After using Kamisato Art: Suiyuu, all nearby party members will have 15% increased Normal Attack SPD for 15s.

C5: Bansui Ichiro

Increases the Level of Kamisato Art: Suiyuu by 3.

C6: Boundless Origin

After using Kamisato Art: Kyouka, Ayato's next Shunsuiken attack will create 2 extra Shunsuiken strikes when they hit opponents, each one dealing 450% of Ayato's ATK as DMG.
Both these Shunsuiken attacks will not be affected by Namisen.