After Bidding Farewell to Mavica, He Declared War on All of Teyvat

[Not a pure sister-sister story] + [Single heroine Mavica] + [No orthopedic plot] + [Growth-type protagonist] + [Darkening] Niedros is the younger brother of Fukalos, whose name is Nienin. They are both Fontaine pure water elves and dependents of the water god Egolia, although he has always wanted to call him mother. Because I couldn't stay away from the boring days in Fontaine, I went to Nata to play, and met a girl with red hair... Mavica: "Please stay with me..." Nining: "Just sleep, don't do anything else..." Everything is beautiful, but short-lived. Many years later, when the flames of the Teyvat War spread to Nata, Mavica once again saw the lover who had a profound influence on her, and now he actually attacked her. The shock and distress on her face that had been calm for many years were floating endlessly... (The early part of this article focuses on the relaxed rhythm of making sugar, followed by the battle of Teyvat and a few knives. In the middle period, polysaccharide makes up for the regrets, and I won't reveal too much about the rest...) (The introduction is weak, the text goes here...)