Madonna ni Tsugu

This is the 6th volume of Tamura Yumi's "Tamu no Nandemo Capsule Series" (a collection of her one-shots).

Madonna ni Tsugu:
Mizusawa Karen, a very skilled archer, was taken in 5 years ago by her father's good friend, the head surgeon of the Tokyo police department medical hospital. On her 16th birthday, however, her adoptive father tells her that she has a bomb implanted in her heart that is set to go off in a week. Now she and two friends must find her real father to have any hopes of surviving...

Umi wa Shizuka na Aki no Meikyuu:
Mio's boyfriend Shou has been missing at sea for several days. Everyone including even Shou's grandparents have given up hope of finding him alive, but Mio is determined to continue searching. One day, she meets a curious guy named Ai, who helps her search and together, they find out that things may not be as they seem...

Toori-ma 1991:
Kiryuu Naoya becomes the private tutor of his friend Ohtakemaru's younger sister, who can't leave the house b/c of her fragile health. Strange occurrences keep happening around the Ohtakemaru siblings, however, and a rumor of a killer on the loose around the premises of their house have begun to circulate. Naoya also seems to have a secret that he doesn't want the siblings to know about, but all of this comes to light one night when...??