After Larcade's surprising reveal and battle with Kagura in the previous chapters, "Fairy Tail" Chapter 510 features Natsu and Zeref's story from their childhood.

In the first scenes of the previous chapter, Larcade, also known as Rahkeid Dragneel, is revealed to have never experienced to be loved by anyone. As a result, he became neutral. His views over his father's preference for Natsu made him show his real abilities in his fight versus Kagura. It was also revealed that Mavis is the mother of Larcade, according to Chatt Sports Net.

Chapter 510, named "Natsu's Heart," tells fans about Natsu's past prior to waking up at X777. Zeref, 'inside Natsu's heart' tells him that he will die soon. Zeref also mentioned that he is inside Natsu's heart to fill up the gaps of his lost memory.

He showed Natsu their peaceful small village, their parents, and how a dragon completely annihilated their town.

He also revealed that the three of them died from the incident, and Zeref tirelessly researched to resurrect Natsu as his very last demon, called "END". Zeref then entrusted Igneel to take care of his younger brother, and a scene of childhood stories with Sting, Rogue and Wendy appears.

Zeref then disappears from Natsu's heart, and Sting comes into Natsu's sight. Sting later brings Natsu to the true identity of the element that lurks inside his body.

Later in the chapter, a severely weakened Kagura and her comrades were hoping for a miracle and hoping for Sting to come. Just moments after, he arrives and gives an opening blow to Larcade.

Larcade then attacked with his pleasure magic, but it did not damage Sting at all; instead, he just ate the weird-tasting, tentacle-like grip attack. He declared that immunity from white magic is one of the perks of being the white dragon slayer.

The battle between Sting and Larcade is expected to continue on Chapter 511.