Lust Nightmare

Lust Nightmare (ラストナイトメア Rasuto naitomea) is the main villain and final boss of Lust Friend. She is the inner self of Mea and is the cause of the succubus world's future destruction.

Appearance
Lust Nightmare has long black hair with blue highlights, blue eyes, pale skin and extremely large breasts. She has curly black horns with blue tips, black wings with blue membranes, and a spaded tail. She wears a skimpy top and underwear, sleeves and thigh-length boots, all black with blue decorations. Overall, she looks like a succubus version of Mea.

Personality
Lust Nightmare is much more confident and aggressive than the quiet Mea. Despite being a succubus herself, she hates the succubi of the succubus world for ignoring Mea, to the point of repeatedly destroying the succubus world.

Along with Mea, Lust Nightmare has a complicated opinion of Magrut. She acknowledges him as their first friend, but doesn't trust him because she and Mea never had any friends and because of Magrut's efforts to befriend succubi. This leads her to try and trap him with her. However, she relents after Magrut proves his friendship with Mea, releasing Magrut and letting the succubus world be.

Background
Lust Nightmare was a succubus born from Mea's desire for friends.

One day, the girls around Mea proposed that she jump off a cliff to prove herself worthy of being their friend. Mea did so and was mortally wounded. Mea thought to herself that she should just give up and no longer have to suffer. However, Lust Nightmare called out to her. She introduced herself and asked Mea what she wanted. Mea replied that she wanted friends who would stay with her.

Lust Nightmare revived Mea and brought her to the succubus world. However, Mea still couldn't make any friends here as the succubi ignored her (seemingly because they could not perceive her at all). She became jealous of the succubi, who captured men and lived so happily with their friends.

Mea's loneliness led Lust Nightmare to repeatedly destroy the succubus world and then turn back time, despite knowing that this would not actually heal Mea's heart.

Lust Friend
When Magrut, another human, is brought into the succubus world, Lust Nightmare speaks to him (though her identity is not revealed at this stage). She tells him that it's impossible for humans and succubi to coexist, and this is world where he can only kill or be killed himself.

Lust Nightmare appears in person if, and only if, Magrut succeeds in befriending Empress. If this happens, Mea brings Magrut into a dark space and then transforms into Lust Nightmare. She explains her nature to him and states that she will now destroy the succubus world permanently. Finally, she mocks Magrut for his efforts to befriend succubi and declares her intention to keep him with her, until she and Mea disappear. In the resulting fight, Magrut talks to Lust Nightmare and eventually succeeds in befriending her. Lust Nightmare disappears, leaving only Mea behind.

If Magrut loses, Lust Nightmare proceeds to rape him. She reverses his time to make him regress into a child, intending to raise him up to be a proper friend for Mea.

Profile
''A succubus born in the dark depths of Mea's heart. To fulfill Mea's wishes, she sought revenge by destroying the succubus world. She is both Mea's guardian and Mea herself. Like Mea, she can't be perceived by any succubi, except for her magical power.''

Strategy
Lust Nightmare is a boss that you do not defeat conventionally, as the goal of this battle is to befriend her. This guide contains details of the Lust Nightmare battle, in the section titled "トゥルーエンド特殊ラストバトル攻略". Lust Nightmare cannot be defeated no matter how much damage you deal, so there is no point in even attacking. Your stats are in fact irrelevant to this battle, since you don't need to attack her and (as noted below) Lust Nightmare uses attacks that deal damage proportional to your maximum Vigor. On the other hand, you don't have Fess' blessing for this battle and thus will be defeated if your Vigor is brought to 0 even once.

For this battle, you will begin with multiple new skills: Agree, Disagree, Prepare and Pray. The first is used to converse with Lust Nightmare, the second leads to an instant defeat, the third fills your Tension to the maximum and gives you an Agility buff, and Pray consumes 100 Tension to fully heal you. Note that you don't have Fess' blessing during this battle, so you'll lose if your Vigor reaches 0 even once.

Lust Nightmare will do nothing on her first turn. On her second turn, she uses Friendly Kiss, which reduces your Vigor to 1 (to half if you use Resist, or to 97% if you use Endure: Mouth). Fortunately, she does nothing on her third turn, giving you an opportunity to heal. After the first three turns, Lust Nightmare will start using attacks that deal damage equal to 1/5 your maximum Vigor (or 1/10 if you use Resist). You should therefore use Prepare whenever you're at 2/5 Vigor, then Pray on the next turn. This will reliably keep you alive while giving you the maximum number of turns free to befriend Lust Nightmare. If, at any point, you forget to use Prepare and have only 1/5 Vigor left, you can use a healing item to buy time to use Prepare and Pray.

To actually befriend Lust Nightmare, you need to use Agree four times (not necessarily on consecutive turns). You will then be presented with a choice of three options. Pick "Mea's past" and then use Agree again and pick "Mea's personality" (or the other way around, it doesn't matter). Don't pick "Mea's choice" as it leads to an instant defeat. The next time you pick Agree, a fourth option will be added: "All of Mea".

The Agree and Disagree skills will now disappear, being replaced with Comfort, Listen and Talk. Use Talk and then pick "Talk about yourself" twice. Don't pick "Talk about your friends", it leads to an instant defeat. After this, use Listen twice. Finally, use Comfort twice. Two options will appear, and it doesn't matter which you pick as both lead to the Friend Flag.

When you obtain the Friend Flag, all of the new skills will disappear, most of your existing skills will be greyed-out, and Lust Nightmare will stop attacking. Use Befriend, and Lust Nightmare will be replaced with Mea. Use Embrace three times to end the battle.

Of note is that Lust Nightmare is immune to the Beg skill.

H-scenes
Lust Nightmare has a pair of H-scenes when you lose to her. She first rapes Magrut in the cowgirl position, then uses her time magic to shrink him into a child and then gives him a breastfeeding handjob, intending to raise him up as a friend for Mea.