From the End of a Life Form

If there is a person like me... Lethe is a young man who is the keeper of the clock tower. Taiga, with whom Lete spent his childhood, comes to visit him. Though confused by their sudden reunion, Taiga decides to stay at the clock tower, but some of the meteor shower that was arriving crashed into the clock tower. While exploring the clock tower that was destroyed by a meteorite, Lethe finds a hidden room, but there is a mysterious device...