The Zashiki Warashi of Intellectual Village - Volume 7, Chapter 5: Jinnai Shinobu@VS Tselika, Opening

Nagasawa crossed to Naruto Universe and was bound to Konohagakure.If Konoha is severely damaged and destroyed, Nagasawa’s lifespan will be reduced.He panicked at the thought of the upcoming Nine-Tailed Demon Fox's attack , and the thought of Konoha getting destroyed left him in despair.Fortunately, while bound to Konoha, he can obtain templates of powerful characters.At the beginning, He got the Whitebeard template! Since it's the Whitebeard from the Summit War of Marineford, he can use Tremor-Tremor Fruit's ability and Haki.Facing the Tailed Beast Ball, which terrorized Konoha Shinobi, Nagasawa leaped and shattered the Tailed Beast Ball with one punch!

It was the twenty-third year of Tianxi*. Rumours traversed the streets that the all-knowing Imperial Advisor suffered a great calamity and could not help but enter seclusion to focus on cultivation. However, the commoners secretly clapped their hands and rejoiced. In the winter of the same year, a young monk appeared in the Hui Zhou Fu’s Ningyang District.

The monk’s monastic title was Xuan Min, his memories all missing, yet was versed in the arts of Feng Shui Kan Yu**. On the very first day arriving in Ningyang, he did not hesitate to take care of a dangerous manor, picking up Xue Xian, who was hidden there, along the way.

Since then, Xue Xian – who had been all-powerful in the first half of his life – gained a new life pursuit: to get this baldy*** who had only a good outer appearance to take his last breath and “smile from his grave”.

Xue Xian: If you are unhappy, then I will be happy. If you die, I’ll laugh my ass off.

Xuan Min: …

- Description from Novelupdates

The male student, Fukai Nagamasa, ignores his studies for college entrance exams in favor of following the path to chuunibyou. As he fainted during night cramming session before the exams, he realized that he was transported to a parallel world as a feudal lord in the Sengoku Era. Not to mention that suddenly, he was marrying the sixth Demon King, Oda Nobunaga’s little sister, the one who was purported to be an unrivaled beauty?