This guide made by text, have some easy steps to teach you how to finish the game fastest as possible, but for first, let me explain how the game works.

[EXPLAINING THE GAME/RUN]

This game is based on choices, that are made by triggering inklings (random events through the World Map), each choice will provide you a different path, with a different faction. I believe that the maximum inklings you can trigger in one play is about 25~30 (in case your going for the true ending or something like that). However, since most of the first available inklings doesn't affect your possible endings, turns out that the game can be finished by triggering only 10 inklings (only 3 of them are important to get to the fastest ending, all the other 7 inklings are purely random and they need to be triggered because, somehow, the game will only unlock the story inklings if you play through a certain amount of random inklings first.

[HOW TO GET THE FASTEST ENDING]

I already played and ran this game multiple times on my X360, and i figured out this ending by watching the actual PC Version WR held by 'therealbmanbeast' and this route can be done in any category including 'Instant Kill' (only if you have a good enemy RNG) so, with no more waiting, let's proceed to the tutorial.

1. [SKIP CUTSCENE x2] choose either the first or the second dialogue choice to be warped to Takatane Village [SKIP CUTSCENE x2],
2. Get out from Osei's House, [SKIP CUTSCENE],
3. Make your way down the stairs and go talk to Kota [SKIP CUTSCENE] choose ''Calm Down,Kid'' dialogue [SKIP CUTSCENE x2]
4. Open the Menu > Map > World Map, warp to Omiki Town
5. Run to the bridge to trigger the inkling [SKIP CUTSCENE]
6. Open the menu and Warp to Castle Amana
7. Talk to the guard in front of the main gate and choose ''Yes!, I have skills to prove!'' dialogue [SKIP CUTSCENE]
8. Defeat all enemies as fast as you can [SKIP CUTSCENE]
9. Open the menu and Warp to Road
10. Run through out the trees in your right side and go to the temple entrance [SKIP CUTSCENE]
11. Warp to Castle Minori
12. Talk to the guard at the gate and choose ''Why don't you use me?'' dialogue
13. Deal enough damage to any guard until the cutscene start (about 40~50% of damage) [SKIP CUTSCENE x2]
14. Warp to Kuchihagahara
15. Go to Shinnosuke's House [SKIP CUTSCENE]
16. Warp to Takatane Village
17. Go upstairs to Osei's House and approach Munechika [SKIP CUTSCENE] choose ''Are you harassing me?!'' Dialogue (this inkling will skip one of Shinnosuke's last Inklings, saving about 30~35 seconds of walking and skipping things)
18. Go home and sleep until NIGHT
19. Warp to Castle Minori [SKIP CUTSCENE x4] (this auto-inkling will skip one of Shinnosuke's Inklings, saving about 40~50 seconds of walking and skipping things).
20. Warp to Kuchihagahara.
21. Talk to Shinnosuke and choose ''Sakura... Sakurai?'' dialogue.
22. Warp to Takatane Village.
23. Go home and sleep until MORNING
24. Go talk to Kota, choose ''You're pretty good'' [SKIP CUTSCENE]
25. Warp to Castle Amana
26. Go to the main building entrance [SKIP CUTSCENE] choose ''The Crest is in Takatane Village'' dialogue [SKIP CUTSCENE]
27. The game will auto-warp you to the Village [SKIP CUTSCENE x4]
28. Warp to Kuchihagahara [SKIP CUTSCENE x4]

[THE END]

[NOTE] I'm still playing a lot, because i believe that there is a way to skip the second sleep time, saving about 20~30 seconds, plus i think that the ''Senseless Person Ending'' can be the fastest one if we use a pre-made character with overpowered weapons, any other thing that i find, will be posted in this guide section, see ya!