Tae-sama
This is Kawaguchi Hidetoshi. This is my humble answer to the question.
It is a friend who has committed suicide and is suffering from PTSD (post-traumatic stress disorder). As you can see in your answers, I think it would be good to be able to receive psychological counseling, be examined by psychosomatic medicine, or participate once in the “Life Gathering” of the “Association of Monks Facing Suicide and Suicide,” which Mr. Urakami also mentioned.
After all, I'm guessing that your friend's suicide was so shocking that it probably caused a huge upset in your heart...
How should we accept the death of a friend and then make a memorial service...
In Buddhism, there is a difficult idea called karma theory and reincarnation theory, and assuming that the mind (inheritance) continues even after the death of this physical body, it is not regarded as “death = end.”
The question is whether that heart (inheritance) will continue even after death. Depending on the state of mind (inheritance), the next state after death will be determined (strictly speaking, karma and karma are greatly related). Typical examples include heaven, man, shura, beast, ghost, and hell as the six ways, but this is just one symbolic and representative category in the form of heart (inheritance). In any case, as long as we are in reincarnation, there is no change in being lost and in suffering. In order to move away from this cycle of hesitation and suffering, it is hoped that people will not do bad deeds, work hard for good deeds, keep their mind clean, and walk a sure path of Buddhism.
I believe that what we can do is to make a memorial service so that the hesitation and suffering of that friend's heart (inheritance) can be alleviated and healed even a little, and furthermore, by receiving a definite relationship with the Buddha, we can aim for enlightenment to move away from the hesitation and suffering, so I think it will be important to make a memorial service.
Please, when visiting graves, Buddhist altars, temples, etc. for your friends, it doesn't matter if you put your hands together and remember them so that your friend's heart is at ease, and that you are being treated by the Buddha of Great Mercy and Taiji, and remember them as if they were walking the Buddhist path, so I hope you can make a memorial service. I would also like to dedicate daily memorial services to Tae's friends.
Kawaguchi Hidetoshi Gassho