ch 1-3 they were classmates in elementry school and MC was most popular kid but then he moves out to big city and realise he is medicore and kinds lost his sparcle then we have action when he is gruwn up and works at some company one day some random guy ask for help while he is in wc bc he was stuck in one of stalls so MC helps him and it turns out to be the classmate that become prince (he was lonley fat kid in elementry school) they get along quite well after that and prince confess that he was saved by MC behaviour when they were classmates and is in love since then with MC, they stay friends for some time and later MC decite to give it a go and they starts dating
ch 4 -5 childchood friends in high school one in prince second is known as his friend but still is very good guy, prince is feminin but knows how to fight and is in love with his bf, after they have some sepereted time during prepering for school festival good guy get confessed go on a date with girl and realise he is in love with prince so he confess get a confession back and they starts dating
later good guy gets anxious and overthink his feeling and isolate himself form prince but they eventually talka it out and it turns fine
Ahiru no Oujisama (Kazao)