Suenagaku Yoroshiku Onegaishimasu

After the sudden passing of her father, Hikaru Takatsukasa is adopted by her cousin Kiyomizu. Hikaru expresses that she is madly in love with Kiyomizu Kuzukiri, but all he wants is for her to act like a normal family member!

(Source: Comikey Media)

Included one-shot:
Volume 3: Yankee to Norainu