Tomodachi 100-nin Dekiru kana

Synopsis

If you can't make 100 friends, humanity will be destroyed!?? One day, the task that the aliens who came to invade the earth gave to humankind is to prove "love." Naoyuki Kashiwa, who was selected as a sample of the representative of the earthlings, was skipped in the 1980s and challenged the test to prove his love there! (Source: MU)