In Devil in The Details, you take on the role of Allan, who gets mugged and then saved by Succubus (It's very episode one of Highschool DxD if you've ever watched that). You are then alerted to the fact that three of your female classmates have been tainted by the touch of a devil. In this guide, I'll give you a runthrough of how best to go about that, and maybe on how to get any of those pesky CG scenes that you may have missed.

There is a lot of potential overlap for events, so if you miss something the first time, you'll probably have another shot at it on one of the later opportunities. I'll try to come up with the most efficient paths a little later in this guide.

Woo, looks like they fixed the CG issue, and we've got some new achievements, fun.

Here are all of the best Routes for events regarding Bri.

Day 1
Location: Office
Best Choices: Multitasking, Common Intrest, Science Club, Okay (Saying "Tomorrow" leaves you with less options on the following day)

The Science Club Date
Best Choices: Chemicals, Newton

Day 2
Location: Classrooms
Best Choices: Rinnie, Fashion, Sports, Lunch, No Need.

Make A Save Here. We'll come back to it later for the Cheryl Route

Day 3
Location: Field
Choices: Homework, Food, Lie, Sweet, Don't Join A Club or get caught in the office.

Day 4
Location: Pool
Best Choices: Poolside, Plans, Flirt

Day 5
Location: Office
Best Choices: Lunch, Silent, Joke, (The last choice is for flavour and doesn't seem to matter)

Exit
Location: Leave
Best Choices: Talk, Small-Talk, Ignore, Spend Time

You should end up with the Charismatic Achievement and the Incubus Achievement.

Hey! Thanks to achievements there is a reason to do this now!

Day 1
Location: Pool
Best Choice: It doesn't matter, but pick Bri. (You'll get an achievement for it)

Day 2
Location: Pool
Best Choices: Corner, No Need

Day 3
The choices for day 3 don't matter for the Bri route. Probably don't flirt too hard with Luci when the options come up.

Day 4
Location: Corridor
Best Choices: Roast, Chat, Science Club, Chemicals, Newton

Day 5
Location: Office
Best choices: Lunch, Silent, Joke, Either Option.

Exit
Location: Classroom
Choices: Join Club (might as well nab that achievement)

Receive achievement for Bri's ending.

I didn't encounter any chances to complete the event that you started on day 2 that is clearly linked to an achievement, which was strange.

There are two Rinnie Routes, and a few achievements scattered between here and there, so lets do some saves and quicksaves to do this with as little effort as possible.

Day 1
Location: Corridor
Best Options: Jewelry, Flirt, Flirt (There should be an achievement here for asking for the phone number, but it doesn't seem to work at the moment)

Day 2
Location: Classroom
Best Option: Rinnie, Physica, Join the Swim Club. (Swim Club Achievement)

Day 3
Location: Pool
Best Choices: Rinnie

Day 4
Location: Pool
Best Choices: Poolside, Plans Back To Class

Day 5
Location: Rooftop
Best Choices: No choices

Exit
Location: Classroom
Best Choices: Club, Ask Out, Normal, Clothing (ignore the error and then SAVE) White will give you one half of the CGs, Leather will give you the other.

Day 1
Location: Pool (There isn't anywhere to talk to Luci on the first day, so lets burn through that Pool event early.)
Best Choices: Luci.

Day 2
Location: Track
Best Choices: Sweet, Invite, Cookies, Defend

Day 3
Location: Pool
Best Choices: Bottom. Don't join a club or go to the office.

Day 4
Location: Science Lab
Best Choices: Tap, Offer, Do Homework

Day 5
Location: Corridor
Best Choices: Cupcake, Students, Enjoy Company

Exit:
Location: Leave

Techinically you can take the Cheryl route way earlier than we're going to here, but you'll miss a CG panel later in, and as far as I can tell there aren't a whole lot of ways to get thise one, very tame, cg pannel, so here we go.

Remember that save you made in the Harem ending? Load that up. If you didn't follow my route for the Harem ending, just scroll up and do the first two days, and then come back.

Day 3
Location: Pool
Best Choices: Luci (We're burning a day again, the pool choice doesn't matter), Check, Focus.

Day4
Location: Science Lab
Best Choices: Tap, Offer, Homework.

Day5
Location: Corridor
Best Choices: Chat, Snacks, Chat

Exit
Location: Leave
Best Chocies: Cheryl.

There doesn't appear to be any way of unlocking Roll 2, image 3/4.

You might not have even noticed that you were missing that image before I mentioned it, but now you know, and you'll probably never be able to unknow that information.