♂ m

Masaru is childhood friends with Rin who soon becomes his stepsister after his father remarried to Rin's mother Sumika. His father dies in a traffic accident soon after the marriage, thus leaving Sumika to raise Rin and Masaru alone. He chooses to call Sumika by her first name, rather than calling h... read more

Masaru is childhood friends with Rin who soon becomes his stepsister after his father remarried to Rin's mother Sumika. His father dies in a traffic accident soon after the marriage, thus leaving Sumika to raise Rin and Masaru alone. He chooses to call Sumika by her first name, rather than calling her "mother". He also does not have good grades due to the lack of motivation.

♀ f

Rin is Masaru's childhood friend and stepsister. She is very popular with both female and male classmates. She's also the top student of the school with better grades than Masaru. Rin has been in love with Masaru for years.

♀ f

Sumika is Masaru's stepmother. She married his father, who died soon after, which caused her to raise Rin and Masaru alone. She is also a teacher at his school.