As the eighteenth prince, Ten’yuu never harbored any delusions of rule, but he loved his mother, and was devastated when she came down with a wasting illness that would eventually confine her to her bed. When he heard a rumor of a high-grade potion Sei gave the sea captain, he hurried to Salutania as a transfer student so he could investigate.
While he initially believed Sei was the alchemist he sought, he apparently no longer does, but asks her to relay his case to them. The task of crafting a cure is further complicated by the fact that Ten’yuu doesn’t know what precise ailments his mother is suffering. The alchemist can very well travel to Zaidera, while his mother is too weak to travel to Salutania.
It’s quite the pickle, but Sei, who feels guilty for having to continue to conceal her true identity, tells Johan she intends on developing a panacea: something Ten’yuu can take to his homeland to cure any ailment his mom might have. Johan is supportive of the idea, as long as Sei remains careful and discrete.
Sei soon hits a dead end, Al returns from his home, and kept his promise to see and greet her before anyone else. Not only that, he’s brought Sei a rare gift as a token of his affection: a jar of apple blossom honey, which is perfect for her tea.
This might’ve been a perfect time for Al to finally tell Sei straight up his feelings for her, but she’s vibing on the apple honey so much it not only refreshes her after being stressed out about the dead end to her research, but actually progresses said research. She never thought to use apples in her panacea.
Johan manages to procure an apple sapling, which he has planted in the royal conservatory, out of sight. Sei works her magic to accelerate its growth and induce it to fruit out of season, producing all the apples she’ll need to complete her panacea. I do wish they’d gone into a little more detail about how she came upon the formula, however.
Instead, in keeping with everyone’s desire to keep Sei’s hands off of this, Ten’yuu is brought before the king, who presents him with panacea potions he claims to be from the royal larder, were made by a famous alchemist, and the formulas to which have been lost to history.
Ten’yuu initially rejects the gift as he’s unable to reciprocate, but the king tells him he needn’t worry about repaying him anything right away. Sei and Jude discuss how Ten’yuu has since set off back to Zaidera…with the potions she made. In this way, she was able to help Ten’yuu and his mother without exposing her sainthood. Everybody wins!
When Sei described the apple honey in her tea as having “a gentle sweetness”, I couldn’t help but think that sounds like a perfect descriptor for herself, and show in general. Kind, gentle, sweet, and talented: that’s Sei to a T. Now, if only she had more confidence in herself as a worthy recipient of Al’s affection!