A stranger on the seashore

Eri from the anime "Stranger by the Sea" (Umibe no Étranger) acts like a sister in the family. She lives with Shun/SHUN and his grandmother.
Eri wonders if Shun likes Mio, whom she refers to as a cute boy. When Mio walks away and calls, out of concern for Shun, she states that Mio shouldn't play with Shun's feelings.
It's also known that Eri lives with Shun and his grandmother, acting like a sister to the family. She wonders if Shun likes Mio, whom she addresses as a cute boy. When Mio left and called, out of concern for Shun, she declared that Mio shouldn't play with Shun's feelings.
SHUN IS SYUN IF THAT'S WHAT THEY JUST CALL HIM THAT.

As a child, Mio had a warm and loving personality. He was a cheerful child who later blossomed into a cheerful adult.
After losing his mother, Mio withdrew into himself and spoke little. He had no interest in any social interactions whatsoever.
After meeting Shun Hashimoto, he gradually learns to open up again. After a three-year absence, he returns with his original warm and sparkling personality.
Mio doesn't often consider the consequences of his actions. He tends to speak his mind and is always open to new experiences.
Due to the early loss of both parents and the demands of hard work, Mio develops a strong sense of responsibility. For example, he takes on the habit of doing all the housework for Shun's parents.

Shun Hashimoto's character from the anime "Stranger by the Sea" (Umibe no Étranger) is described as immersed in dreams of a literary career. He doesn't seek out company and is indifferent to female attention.
Xiong works tirelessly when necessary, which may explain his pessimistic outlook on life. He typically works on his work until the deadline, sacrificing rest and failing to properly take care of himself in the process.
Xiong speaks directly and mostly without a filter, but can also be sweet when he wants to. Despite his outwardly laid-back demeanor, he's easily flustered. He's particularly prone to introspection and overanalyzing things.