set would need a normal difficulty as well to be a full mapset since the drain time is less than 3:30 nyaa (drain time is currently 3:21 according to site)
beatmap section in RC:
Difficulties below the highest difficulty can combine break times with drain time to meet the above thresholds.
In the title field, there must be a trailing space after "chuu-tan" and "CV:". It should be "Kawaikute Gomen feat. chuu-tan (CV: Hayami Saori)"
GD mapper "Tachibana Gekka" is not in Tags, please add it to make it easier for players to find the map they contributed to.