When Rantarou met Kaede Akamatsu and Shuichi, Shuichi seemed confused how Rantarou mentioned about everyone gathering and getting amnesia. He thinks he is some way mysterious and has some clues about his backstory. Later, Shuichi became quite hostile towards Rantarou later in Chapter 1 based on his suspicion as being the mastermind and forgetting his talent.
In the love hotel event, Rantarou has the role of a private tutor or a teacher of Shuichi. As the situation reflects the relationship between Rantarou and his younger siblings, he treats Shuichi like a child, which makes him a bit uncomfortable. Because of this, Rantarou assumed that Shuichi dislikes him, but Shuichi denies it. Rantarou is relieved that Shuichi doesn't despise him, but he states that he no longer would be his teacher, as he thinks he made Shuichi uneasy and he could be in danger with him. He wishes to protect Shuichi, so he wouldn't lose another person that is very important to him. He mentions the possibility of himself dying and while he claims he was joking, Shuichi doesn't believe him. Shuichi tells Rantarou he would rather hear his story even if it is a risk rather than leave Rantarou to deal with it alone. In the end of the event, Rantarou feels very glad, trusting Shuichi even more and waiting for the time to tell him his story.
The ship sailed as a result of Rantaro reminding a lot of fans of Nagito and Shuichi being the main protagonist, which resulted in some fans picturing them as having interactions similar to Komahina.
- Rantaro Amami/Shuichi Saihara tag on AO3
- Rantaro Amami & Shuichi Saihara tag on AO3
- Amami/Saihara tag on FanFiction.Net
- Amamatsai refers to the ship between Rantaro, Shuichi and Kaede Akamatsu
- Oumamasai refers to the ship between Rantaro, Shuichi and Kokichi Oma