What follows is a translation of the walkthrough on:
http://www.diana.dti.ne.jp/~spike/otona/kouryaku/07ma/muvluv.htm
with a few zillion tab characters added for formatting.
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Muv-Luv Extra Walkthrough
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-=Sumika=-
10/21 1) I guess it was fun.
10/22 2) Wait, that's not the issue here!
10/23 1) Sumika
1) Clean
10/24 1) Eat Sumika's lunch
1) Go home
1) Advance
2) Keep moving
2) Keep maintaining distance
10/25 1) Sumika!
1) Eat Sumika's lunch
1) Go to the archery range
10/26 1) Eat Sumika's lunch
10/27 1) Sumika
1) Sumika
10/29 1) Go out with her
10/30 2) Let me think about it
1) Go home with her
1) Yes
10/31 2) I can't accept that
2) Sumika, good luck
11/01 1) Go to the roof
11/02 Save Point A (For Normal Ending 2)
1) Stay with Sumika and Meiya
11/03 1) Sumika
11/04 1) Gotta be Sumika
11/07 3) Get in the car
11/08 3) Wait until school ends
11/09 2) Come up with a plan
11/26 2) Sumika's wouldn't be too bad......
11/30 2) Walk home
12/07 1) Hmmmm......I think it suits you, kinda?
12/15 3) Video game
12/19 1) Next to Sumika
12/21 2) No, it's okay
-=Meiya=-
10/21 2) I'll never forgive that damn dog!
10/22 1) Please recreate the Manchu Han Imperial Feast!
10/23 2) Meiya
1) Clean
10/24 2) Eat Meiya's lunch
1) Go home
1) Advance
1) Shoot
1) Head in for close-quarters combat
10/25 2) I'll ask Meiya
2) Eat Meiya's lunch
1) Go to the archery range
10/26 2) Eat Meiya's lunch
10/27 2) Meiya
2) Meiya
10/29 2) I can't do that
10/30 2) Let me think about it
2) I need to think about this alone for a while
1) Yes
10/31 2) I can't accept that
1) Close quarters battle
11/01 1) Go to the roof
11/02 1) Stay with Sumika and Meiya
11/03 2) Meiya
11/04 2) Meiya
11/07 3) Get in the car
11/08 3) Wait until school ends
11/09 Save Point B (For Normal Ending 1)
2) Come up with a plan
11/26 1) Guess I should go do it myself, like Meiya said......
11/30 1) Get in the car
12/07 2) At least the dress looks pretty
12/15 1) Stuffed animal
12/19 2) Next to Meiya
12/21 1) I want to hear about it
-=Tama=-
10/21 2) I'll never forgive that damn dog!
10/22 2) Wait, that's not the issue here!
10/23 4) Make a mad dash for the exit!
2) Try going to the cafeteria?
2) Run away
2) Behind the school
10/24 3) Flee
2) Physics Prep Room
2) Go to the back of the school
1) Advance
2) Keep moving
2) Keep maintaining distance
10/25 3) Tama might have something......
3) Chase after Tama
1) Go to the archery range
10/26 3) Eat Tama's lunch
10/27 3) Tama
3) Tama
10/29 2) I can't do that (Sumika)
10/30 2) Let me think about it
2) I need to think about this alone for a while
1) No
10/31 2) I can't accept that
2) Long range battle
11/01 1) Go to the roof
11/02 2) Go home with Tama
11/03 3) Miki
11/04 3) I'm worried about Tama
1) Go to Tama's house
11/06 1) Let's go for it together!
11/09 1) Call out to her
-=Sakaki=-
10/21 2) I'll never forgive that damn dog!
10/22 2) Wait, that's not the issue here!
10/23 4) Make a mad dash for the exit!
2) Try going to the cafeteria?
1) Clean
10/24 3) Flee
3) Courtyard
3) Wander aimlessly
2) Retreat
2) Keep moving
2) Keep maintaining distance
10/25 1) Sumika!
3) Eat both
3) Courtyard
2) Go to the field
10/26 1) Eat Sumika's lunch
10/27 4) Class Rep
4) Class Rep
10/29 2) I can't do that
10/30 1) I accept
2) I need to think about this alone for a while
1) No
10/31 1) Sumika, change places
11/01 1) Go to the roof
1) You can go home without me
11/02 2) Go home with Class Rep
11/03 4) Chizuru
11/04 4) Obviously, Class Rep and Ayamine!
11/07 1) Walk Sakaki home
11/08 1) Talk to Class Rep
11/09 1) Do nothing
11/13 1) I can't say
-=Ayamine=-
10/21 2) I'll never forgive that damn dog!
10/22 2) Wait, that's not the issue here!
10/23 4) Make a mad dash for the exit!
1) Go to the roof?
2) Run away
2) Go to the back of the school
10/24 3) Flee
1) Roof
3) Wander aimlessly
3) Move right, Retreat
1) Shoot
2) Keep maintaining distance
10/25 4) I should go right to Ayamine......
3) Eat both
1) Roof
2) Go to the field
10/26 1) Eat Sumika's lunch
10/27 5) Ayamine
5) Ayamine
10/29 2) I can't do that
10/30 2) Let me think about it
2) I need to think about this alone for a while
1) No
10/31 1) I accept
1) Close quarters battle
11/01 1) Go to the roof
1) You can go home without me
11/02 4) Follow Ayamine
11/03 5) Ayamine
11/04 4) Obviously, Class Rep and Ayamine!
11/07 2) Follow Ayamine
11/08 2) Go look for Ayamine
11/09 1) Do nothing
11/12 1) Do it
-=Marimo=- BAD END
10/21 2) I'll never forgive that damn dog!
10/22 2) Wait, that's not the issue here!
10/23 4) Make a mad dash for the exit!
2) Try going to the cafeteria?
2) Run away
2) Behind the school
10/24 3) Flee
2) Physics Prep Room
1) Go home
1) Move left
1) Shoot
2) Keep maintaining distance
10/25 4) I should go right to Ayamine......
3) Eat both
2) Physics Prep Room
2) Go to the field
10/26 2) Eat Meiya's lunch
10/27 3) Tama
4) Class Rep
10/29 2) I can't do that
10/30 2) Let me think about it
2) I need to think about this alone for a while
1) No
10/31 2) I can't accept that
1) Close quarters battle
11/01 2) Go to the physics prep room
11/02 1) Stay with Sumika and Meiya
11/03 1) Sumika
11/04 2) Meiya
11/07 3) Get in the car
11/08 3) Wait until school ends
11/09 2) Come up with a plan
11/26 1) Guess I should go do it myself, like Meiya said......
11/30 1) Get in the car
12/07 2) At least the dress looks pretty
12/15 2) Book
12/19 1) Next to Marimo
1) Embrace Marimo-chan
-=Normal Ending #1=-
11/09 Start at Save Point B
1) Do nothing
-=Normal Ending #2=-
11/02 Start at Save Point A
2) Go home with Tama
11/03 3) Miki
11/04 3) I'm worried about Tama
1) Go to Tama's house
Unlimited
-=Common Route=-
01. Tighten my left elbow...
02. Take that!
03. I-I have to admit...
04. I can't die
05. Swords won't work on our enemies
06. Because they never run out of ammo
07. Marbles (Try other choices, #1-start)
08. Okaaay Ayamine, I'll take you on!
09. Anyway, I've gotta make up some kind of excuse even if it kills me!!!!!
10. The battery died, that's all (upto here, #1-end)
11. That's true, but...
12. Obey her
13. Retrieve the rope/Save the rifle round (extra CG)
14. Retrieve the canteen
15. An Eishi's will-power
16. Class Rep, you okay?
17. Tamaaaaa, you still alive?
18. Guess I'll borrow one from Mikoto...
19. Continue down the trench
20. Class Rep
21. Guess I'll go see how Meiya's doing
22. Guess I'll go see how Tama's doing
23. Guess I'll go see how Ayamine's doing
24. Guess I'll go see how Mikoto's doing
SAVE - 1
-=Meiya=-
LOAD - 1
25. Yeah, it's Meiya
26. I should leave now (2nd playthrough)
27a. Okay -> Meiya's Normal Ending
27b. Pleae live -> Meiya's Ending
-=Ayamine=-
LOAD - 1
25. In the end, Ayamine
26. I should leave now (2nd playthrough)
27a. Okay -> Ayamine's Normal Ending
27b. Pleae live -> Ayamine's Ending
-=Tama=-
LOAD - 1
25. Tama... definitely her
26. I should leave now (2nd playthrough)
27a. Okay -> Tama's Normal Ending
27b. Pleae live -> Tama's Ending
-=Sakaki=-
LOAD - 1
25. Gotta be Class Rep, right?
26. I should leave now (2nd playthrough)
27a. Okay -> Sakaki's Normal Ending
27b. Pleae live -> Sakaki's Ending
-=Mikoto=-
LOAD - 1
25. ......it's Mikoto
26. I should leave now (2nd playthrough)
27a. Okay -> Mikoto's Normal Ending
27b. Pleae live -> Mikoto's Ending
-=Yuuko=-
LOAD - 1
25. Gotta be Class Rep, right?
26. I can't leave her like this (2nd playthrough)