Rising Sun

If I have an Ally, and during a Battle I Seppuku 2 figures (2VP, plus another 2VP from Righteousness), and then I win Imperial Poets (5 VP), how many extra VP does Loyalty grant me?

The resolution of each War Advantage is a separate event, so those were two separate instances of gaining VP. You gain 1 extra VP during Seppuku and 1 extra VP during Imperial Poets.