101Leafy researched the games.
Buster Sword+

Made from highly purified steel, improving Attack. Can be further improved.
| Class | Great Sword |
|---|---|
| Rarity | 1 |
| Attack | 384 |
| Slots | 0 |
| Price | 850z |
Upgrades
| Upgraded from | Buster Sword |
|---|---|
| Upgrades into | Buster Blade, Defender, Iron Katana |
Upgrade tree from モンスターハンターポータブル 2nd G 公式ガイドブック (Enterbrain, 2008), page 684.
Materials
Normal Ticket ×1