Doing Something with my ‘Angel’ Little Sister in Another World

I destroy all its tentacles…? No, I don’t think I can do that.
Its skin is too thick.
I will definitely exhaust all my mana before I manage to do that.
After all, it has 10 big tentacles with thick skin.

Moreover… I have one more concern…

The boss said that the lord wouldn’t go up here to the shore, but honestly, I doubt it.

It surprisingly has intelligence to the level where it spontaneously guards its weak spot, so I think the lord can go up to the shore anytime it wants.
If that’s true, it would be dangerous if it suddenly rushes at me then.

Ughh… I’m getting worried…

「Stone Wall!」(Mark)

Just in case, I started creating multiple walls about 3 meters tall on the coast.

Alright, now I’m safe for the time beiー EEHH!?

However, right after I started creating the walls, the lord suddenly rushed over here, but luckily, I managed to finish the walls faster, so the lord hit its body against the wall as it rushed.

Wow, that was close!

「Boss-san! The lord is coming for me! You said it won’t come out of the lake!」(Mark)

I looked at the boss fisherman who was watching from a safeplace and complained to him.

The boss then replied to me with a confused face.

「But it never came out of the lake! I swear! Perhaps it’s coming out now because you made it angry! No one in this village can hurt the lord like you after all!」(the boss)

Oi, seriously? The fact that it won’t come out of the lake is my only peace of mind, but that fact now turns out to be wrong.
Aahh! This is bad!

At this rate, it will eventually break through my walls! What’s worse is I can’t kill it because it keeps guarding its forehead with its tentacles!

Should I just try to continue attacking it until I exhaust all my mana? Maybe I could destroy all its tentacles before I run out of mana… Maybe…

Or… should I just give up and ask Celine for help before I get seriously injured…?

When I was thinking while expanding the stone walls just in case, Nicola sent a telepathic message with a relaxed voice.

『Onii-chan, please defeat it quickly.
I’m hungry.』(Nicola)

『Can’t you see I’m on the verge of life and death here!? I want to kill it but its skin is freaking thick.
Can I just give up?』(Mark)

『Hahh, you’re so hopeless… Look at that monster.
Normally, a boss monster like that is extremely delicious.
Ah, but it indeed has a thick skin, so Onii-chan, you have to be the one to cut it before we eat it.』(Nicola)

『Stop talking as if you’re sure I’m gonna win! It will be a death flag for me!』(Mark)

『But what I said is true, right? There’s no one in this village except you who can cut that monster’s thick skin.』(Nicola)

『Well, you may be right.
If I manage to kill it and we are going to eat it, I can cut it with my…..
Aa!』(Mark)

That’s right! I see now!

I turned my face and looked at Nicola who was in a safe place with Celine.

She was folding her arms while looking at me with a smug face as if saying, “Looks like you have noticed it”.

Hahh… If she wanted to give me a clue, then why didn’t she just tell me immediately!? Can’t she see that I’m in danger right now!?

Oh, well… She’s annoying but thanks to her, now I know how to defeat this monster.