Kawai and Junta: somehow have always been together, ultimate power couple, almost get married the moment Junta graduates, basically lived together since high school.
Hanai and Tajima: get together early, surprisingly normal couple considering who they are, are not talkative about their relationship so you could wake up one day and discover they’ve been engaged for five months now and the thing wouldn’t surprise you in the slightest, not particularly affectionate in public but everyone knows they are together.
Yuri and Ochi: that lesbian couple who have been breaking up and getting back together for the past ten years, u-hauling into each other house the day after they get back together, dated all the lesbians from their friend group during break ups, got married at 35.
Izumi and Hamada: they date for months and Hamada has absolutely no idea. He comes to his senses one day and tells Izumi he thinks he’s in love with him. Izumi doesn’t even look at him and just tells him “we’ve been dating for the last five months but good morning”.
Kanou and Oda: they act like a old married couple in their 80s but refuse the idea they are basically married.
Abe and Mihashi: it took them 5 years to understand they may be liking each other. Another year to accept that. Another six months before Abe somehow confessed. Another three weeks before they kiss each others cheeck. They marry at 40.