Great bittersweet story, despite not having the supernatural tag, the trip between other worlds took me by surprise.
Although at first I got a little angry with the FL for being a home breaker, I enjoyed seeing her evolution, my anger went to Shinji, since he is responsible for saying STOP !, which he did not do, and despite That she concealed the pregnancy, she never made sure to see if it's okay ... if it's a character shit, I hope Tomo gives her his well deserved punch.
At the end you could see the symbols with the rain (tears), the watch (she compared it to an engagement ring) and red (the color of the watch), which at the end in the small vignettes we see that her taste changed to him. Blue color, like the band that his dear son gave him, a story of self-improvement, self-understanding and making you react that what is bad is bad and not only hurts you, but also the people who love you too, me I'm glad that in both worlds, each one can keep moving forward, and although Tomo never exists in the world, maybe when she gets to know the right person for her, her son may be the incarnation of Tomo ... that's my end happy in the distant future, and also that she reconciles with her best friend Shino.