- both have hidden identity
- great main couple
- similar comedy and both great at sentimental moments
- very good looking cast
- best friends that know about their condition

- both dramas have a FL that changes identity/her appearance
- very nice and healthy couple
- mutual support and great chemistry
- best friends that know about their condition

Both dramas have a main couple that deals with time loops. They have to find out how to end it and what is behind the loop. In Todome no Kiss the loop is, like in Reset, made by the Leads dying. Both have lots of suspense and are interesting to watch.

I feel that the chemistry and the characters are quite similar feeling:

-The male lead is a rich arrogant man (in an amusing way)
-The comedy is quite similar
-The female lead is quite optimistic and very capable
-The couple works well together and cherish each other in their own ways

The mother show of this spin-off. The side couple of Cherry Magic explores their story.

Both fantastic and heartfelt BL's. His is about two teenage lovers that broke up in college years and reunite in adulthood with completely different lives.
There is slice of life, there is pain of the past and there are lingering feelings. I feel like both dramas have a more mature side to it but still come across very soft with deeply rooted emotions.

If you're looking for another fluffy (or even fluffier) show, Love Is Sweet is what you want. Both shows have wonderful Main Couples, great Characters and are just wonderful to watch if you feel a little down or just to make you feel good. I love them both but I must admit that Love Is Sweet is more memorable of those two!

They aren't per-sé alike but what makes me connect these two is how wholesome the couples are.
Life Senjou is about two boys finding love in their young years and continuing to love each other in a society that doesn't accept them. The focus here lies more on the story of their lives and has a realistic approach, whereas 30sai made Dotei is definitely more comedic and light-hearted.
Nevertheless, I truly love both of these and they are my favourite Japanese BL's this year. If you enjoy a sweet romance, these are your home.

While in itself being quite different ( Mermaid mystery vs. BL drama) they both share a plot of reincarnation and rediscovering the past memories and the hidden conspiracies around their past selves. I really love both of them a lot and rewatched them several times. If you are looking for something fresh and fluffy, check them out!

I think first of all the obvious similarities stand out: The gamer relationship between two people. Both couples get involved with each other through some coincidences and end up falling in love. Further than that, I would like to note that the leads are really good fits for each other. (Almost) no annoying misunderstandings, and if, they get resolved rather quickly. The MCs show great understanding of each other and fall in love pretty early on and more so try to stand up against outer dangers together. They are really fluffy and calm. The FLs are pretty similar on their own, too. Calm, smart, talented in their field. They don't need a man to help them at all. They have quite healthy relationships. Overall the dramas just give out very similar vibes and are an easy watch, if you need a good old romance without too much angst or second-lead drama.

While they are quite different, at the core they both share the 'Trapped in a story'- plot. While the FL in Extraordinary You gains self-awareness of being in a comic book, the FL in TRoTaR is an author suddenly waking up as a character in her own story. Both FLs are side-characters that are bound to die but try to change their fate while also experiencing and somewhat unexpected romance.