Description:

Because her father was sent to London to work, Natsumi, a 4th grade student, also must leave Japan along with him. Her classmates throw a farewell party for her. Natsumi is prepared to go to London, but on the night before Natsumi's arranged departure, a baby suddenly appears in her house after a roar of thunder! What's more is that this little baby is actually the one that Natsumi will give birth to in fifteen years! (Source: Aku Tenshi)

Description:

The future where the Virus of Death shall destroy humanity awaits. In order for humans to avert that destiny, Raito is asked to travel back to the past. His mission: to make sure a normal high school freshman Tanaka Yuu makes children with his childhood friend Takane Kyouko! (Source: MangaHelpers)