A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 11 April 2008
Eastern Hub Port:
After the first Battle action resolves each turn that attached a card to one of your Personalities: You may take an additional Battle action.
Asako Takakazu xp:
Battle/Open: Even if he is not at the current battlefield: Attach a Spell to Takakazu from your hand (paying all costs). If you used this ability as a Battle action, you may immediately take an additional Battle action.
If Takakazu's action is my first Battle action of the turn that attached a card, do I get to take 2 consecutive actions after the attachment?
Alex Jones (rules official), 11 April 2008
Eastern Hub Port:
After the first Battle action resolves each turn that attached a card to one of your Personalities: You may take an additional Battle action.
Asako Takakazu xp:
Battle/Open: Even if he is not at the current battlefield: Attach a Spell to Takakazu from your hand (paying all costs). If you used this ability as a Battle action, you may immediately take an additional Battle action.
If Takakazu's action is my first Battle action of the turn that attached a card, do I get to take 2 consecutive actions after the attachment?
Yes.
See http://rules.l5r.com/Glossary_A#Additional for more information.