We analyzed 99 of the tweets by @５号 （三月沼津幕張行き確定） and here's what we found.
Note Timezone shown is UTC+0. Current UTC time is 06:33:29 +0000. The world clock can help you compare different timezones. If the tweets are spread evenly across the full 24 hour span, chances are that it's been set up to tweet automatically.