Could anyone advise me about the run, the actual route or something please, thanks in advance

I should really make my notes into an actual written route at some point, but the route is based on this old GameFAQs thing http://www.gamefaqs.com/ds/935689-the-world-ends-with-you/faqs/54810

It explains the equip/item route but it's way too safe in many ways, giving a final estimate of around 4:30 IGT which is way too slow. For fights and more unsafe, faster strats VODs should be enough.

Hi! I wrote the speedrun walkthrough FAQ 6 years ago.

You're right, the FAQ played it very safe; this was done intentionally because I wanted it to be good for new players. In addition, I merged the low ESPer hard run instructions into the normal speedrun, adding a few steps along the way. The low ESPer hard run is a nightmare, by the way. Don't try it unless you're a super masochist, though grinding for Black Jeans makes it much easier.

One Stone Many Birds (OSMB) is still the ultimate maingame pin because the Burst Rounds psych is 150% efficiency. There is no other pin that comes close to its damage, other than Tin Pin Custom (the generic Burst Rounds pin).

The fastest strategy is SOS (halved HP), which the FAQ didn't cover. On W2D5, you get the pin Tin Pin Thrift, and the threads Camouflage and Sun Emperor. Unlock the abilities and equip these two with Biker Jacket and Purple Sneaks on Neku. He'll have 33+65 (OSMB atk) ¤ 1.65 = 161 final ATK, which is much higher than the standard Biker Jacket/Purple Sneaks/Naraka/Green Warm-Ups setup of 30+65 = 95 final ATK. A 5X puck under SOS is the equivalent of an 8.5X puck with the normal setup. I'm pretty sure with SOS, the IGT can go under 3h50m.

You'd also want to cut some of the pig battles, and to run Poison Bones for every non-boss battle just to get the DEF Break debuff. Noise with DEF Break take double damage.

Maybe I'll reroute and try the whole SOS speedrun in the summer. My DS is in another city right now. In the meantime, you can check out my iOS FTA:H run: