Tsuki Oni -TSUKIONI - Oni no Fusui Aki no Sho Kodansha X Bunko

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

After the battle in Kumano, Takuya returned to his family home, Hanamori-jinja Shrine.
Kaoru also returned to Nanyo-kai and began to live in a condominium in Harajuku with his younger sister, Tomiko. However, just at that moment, something unusual happened.
When Takuya returned from outside, the shrine grounds were surrounded by a mysterious fog and he could not enter.
In addition, Tomiko, who had been visiting with Takuya's family, remained trapped in the fog.
Can Takuya and Kaoru rescue their family? And the fate of their love is.