The battle between chara and sans continues ... However, chara can't hunt down sans and is driven into anger. So chara is forced to make a decision for a reversal.

part1→   • 【undertale】sans戦　うごメモver　「序章」  

part2→   • 【undertale】sans戦　うごメモver「本当の戦い：決断」  
※ These are not translated, so they are still in Japanese.

SE I borrowed it from 効果音ラボ and On-jin and ニコニコモンズ and フリー効果音・無料効果音素材.

BGM It's Raining Somewhere Else→   • Undertale OST: 063 - It's Raining Som...  
　　　Megalovania→   • Undertale OST: 100 - Megalovania  
　　　Megalo Strike Back→   • Megalo Strike Back (Chara fight theme)  
　　　"Phase 2" (Megalo Strike Back)→   • Undertale: "Phase 2" (Megalo Strike B...  


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English translator→twitter.com/krispyfff