Sayonara Ryusei, Konnichiha Jinsei 7 [Light Novel]

[Machine Translation] Dolan, a frontier villager who possesses the soul of the strongest and oldest divine dragon, attends Galois Magic Academy with a beautiful half-human, half-snake girl as his messenger. During a long summer vacation, Doran visits a summer resort by the sea and enjoys his holiday with his friends. However, a horrifying sea monster, the "Sea Demon," attacks, and the seaside town is immediately plunged into chaos. Dolan and his friends fight off the sea demons who plan to resurrect a deformed evil god and extend their evil influence to the earthly world. However, something strange is also happening at the bottom of the deep sea. The sea demons and the army of dragon species are staring at each other. When the mother and daughter of the Water Dragon Emperor, who adore Doran, challenge to a decisive battle against the king of the sea demons with whom they have a long-standing relationship, the strongest divine dragon descends upon the battlefield!

最強最古の神竜の魂を持つ辺境の村人ドランは、半人半蛇の美少女を使い魔としてガロア魔法学院に通っていた。夏の長期休暇を利用して海辺の避暑地を訪れたドランは、友人達と過ごす休日を大いに満喫する。ところがそこに、おぞましき海の魔物「海魔」が来襲し、海辺の街はたちまち大混乱に陥ってしまう。異形の邪神を復活させ、地上世界へ魔の手を伸ばさんと企む海魔達をドランは仲間とともに撃退する。だが、異変は深い海の底でも起こっていた。睨み合う海魔と竜種の軍勢。ドランを慕う水龍皇の母娘が因縁深き海魔の王との決戦に挑む時、最強の神竜が戦場に降臨する!