Omae no Kubiwa wa Kiss Mark (Dahlia Bunko)

[Machine Translation] One day, on his way home from school, Korin Kan'ya is summoned to the head family. In fact, there is a long-standing tradition in the Kan'ya family that after reaching the age of 18, a beast with power is given to the child. If he cannot control the beast and form a bond with it, he will be the first member of the Kan'ya family to fail. However, Kuroyoh, the beast given to him, does not obey Yukimichi at all, perhaps because of its enormous power.... With the help and interference of others, Kourin tries to start with skinship...?

鑑夜幸倫はある日、学校帰りに本家へ呼び出される。実は鑑夜家には古くからのしきたりがあり、満十八歳を迎えた後に力を持つ獣を授かるのだ。その獣を御して絆を結ぶことが出来なければ、鑑夜家初の落第になってしまう。だが与えられた獣・黒耀は巨大な力を持つためか、ちっとも幸倫に従わなくて...。周囲の協力や妨害の中、まずはスキンシップから始めようとする幸倫だが―!?