While packing for a move, elementary school student Ryuuhei finds his father's old school notebook detailing a search for a treasure in Tokyo's vast network of underground passages. With his little brother tagging along, he and three friends from an online chat room gather and set out on a quest to find the treasure. What they discover instead is an entire underground community composed of assorted eccentrics, including a senile old soldier still performing a World War II-era mission.
 
(Source: Anime News Network)

Collection of short stories, from 1979-1995. 
1. Sos! Taitokyoo Tankentai 
2. Run 
3. Speed 
3. Neko Ha Yoku Chopo Ni Kaeteruku 
4. Abunai! Seito Kaichoo 
5. Hoomonsha 
6. Sun Burg Hill No Omoide 
7. Eiyoo Manten Episode I 
8. Eiyoo Manten Episode Ii 
9. Madoros Kun 
10. Sukiyaki 
11. Night Flames 
12. Visitors

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