"Romantic Flight" is a bonus feature that was included in volume 13.
Kenichi is shrunk to Tōchūmaru's size and visits his home. Tōchūmaru urges Kenichi to take a ride on his flying bicycle, but the trip ends in a crash landing in Ryōzanpaku's hot spring.
Chapter Notes Edit
The story was animated and included as an extra on the DVD containing OVA episodes 6 and 7 that came with the special edition of volume 54.