High school girl Hikaru is aggressively pursuing her goal of becoming the wife of Kiyomizu, the clumsy tsundere calligrapher she lives with.
To break free from their relationship that looks like nothing but a guardian and his child, she plans a trip for the two of them under the guise of “Mother's Day."

"I will make it impossible for you to keep wearing that guardian mask of yours."

Volume 4 contains a kiss that results in a whirlwind of emotions!