itch.io

You need to finish to the final Cocona quest, fight Big Mama to let her agree that you can leave Noer island with Cocona. Once you have finish that part and get Big Mama approval, you will get nil duration for hiring Cocona and she will never leave until you ask her.

It is easy to finish the quest without letting Cecily get hurt if you are aiming that for the gold coin. Here is what you need to do. 

1. Make sure everyone stay in the room first where Cecily is captured without trigger the alert of the enemies. 
2. Use Rally Trumpet or ask Gray Rat to follow you to lead him to the only exit of the room. Then ask Grey Rat to wait which allow him to block on the exit of the room. 
3. In the mean time, lead Cecily to the corner of the room and ask her to wait. Do not let her stay right behind Grey Rat since the enemies can attack 1 tiles behind Grey Rat.
4. (Optional) use Throw to drag the enemies to the mines to reduce their number first, it is easy to kill at least 2 of them and make 1 injury badly. As long as Lona and Grey Rat are not in battle, Lona is able to walk pass Grey Rat without be blocked by him. You can walk back to the room when you are done.
5. use Throw to drag the enemies to trigger the alert and start the battle. Just stay in the room and let Grey Rat do all the work. Grey Rat has a tons of HP and allow him to take down the enemies one by one as long as the battle is 1v1. Including the reinforcements.
6. After take down all enemies. Just leave by walking to the front door.

The quest is pretty easy and I think that it is well design as long as you are using the right strategy. It is pretty hard if you and the allies just ran out and fight without any strategy. OFC 3 man can't defeat a bunch of enemies without strategy.

I would say, you main source of damages are still Juicing and Summon Siren. Not the Water Shot. You can still put all your WIS and focus on dealing damage with Water Shot  but it would be better to rebirth to other race and use Water Staff instead. 

Juicing is main damage source of succubus build. If you have high Weak status, most of the male enemies will try to grab you instead of attack you. You will have a gap to grab them by using Juicing skill instead. Once you are in sex whether entering it by you grab the enemy or they grab you, you can use ASDF key to deal damage depends on you are using which hole to sex and the sex attack will consume your Stamina. Sometime it will exit the sex and stun your enemy a very long time, it will allow you to rest to recovery your stamina and allow you to grab them again until they are dead. It is suggest that you should grab the enemy instead of let them grab you since they will injured you if the sex is started by letting the enemy to grab you. In this way you are impossible to lose if you still have stamina and the sex is not interfered. Please note that your Siren will interfere your sex battle and the enemy will be angry once you are perform any type of attack, including grab them by Juicing and stun them by Idol of the Believer although they are not dealing any damage.

In normal form , you will need to wear the armor which can increase Weak. Sex doll set is very good for increasing you DEF and Weak at the same time. If you are planning to use other type of armor like Martyr's Set, then Glass and Atoner's Pendent are very good equipment for you to increase Weak. In Sea Witch form, it automatically give you 1000 Weak so you don't need to worry about the armor.

Summon Siren is the other way to fight which allows you to deal with multiple enemies and the enemies which cannot be juiced. Siren only deal 1 hp damage but they are also dealing decent Stamina damage which depends on your WIS. You can consider that unit in this game has two type of HP bar: The actual HP and Stamina . Either one go to zero will able to defeat the enemy. You can have 2 Siren at the same time so just spam summon it when it is defeated (You can kill it by approaching them and press confirm button or just use your water shot to attack them when they are no Stamina to fight and enemy is focusing on attack you). It is better you use "Rallying Trumpet" which allow you to command them to move and encounter enemy so Lona didn't need to move too close to the enemy. They should be able to dealing with most of the enemies. Some enemies may be too strong for the Siren like Big Mama or DICC the Impaler. Bring some Frag Mine and use them instead. 

The Wiki page also told you Water Shot wouldn't be your main source of damage. Only use it to draw the enemy if you needed and let the Siren do the rest of the job. It also make enemy angry and target you if you attack them until they are attacked by the others. So only use this skill if you are not planning to juice your enemy and make sure your Sirens are still able to attack your enemies.