Sigh, give it up, the mango is all you have left.
I wrote the goddamn wikipedia article for this thing, and even I have lost hope. It's /a/ and /jp/'s Mother 3.
Sakura Taisen languishes in game-license purgatory: it's just too niche (even by ATLUS standards) to justify the cost of localizing it. I shudder to think of what it would take to dub the damn thing to a similar quality level.
The strong sales of the animu and mango might make a convincing case...in 2003, when the PS2 was a strong platform. It still is, but it's just too old.
Learn your Japanese and die happy.