A very quick google translate appears to have the MC using a mail order system to switch souls with the target, while keeping the memories from the original body...?
summery. MC get a suspicious app about picking a new body, but the price is very affordable and gives it a try anyways. MC picked an Idol he's been following and masturbating to for awhile. While looking at his new body, he remembers that his female body really enjoys nipple masturbation. MC then remarks about how she/he's a chaste idol. While MC looks at his new pussy and how it feels he decides to record everything for documentation and future masturbating material. ( from this point on the MC is recording themself and talking to the camera kinda like someone is watching) MC proceeds to enjoy his first female clitoris orgasm and another nipple orgasm. MC can't believe that this chaste idol is actually a pervert. then while masturbating to what was just recorded MC Decides to have a "penetration party" and record it too. Next page, MC has used his old life's online accounts to order a bunch of toys and other stuff for the penetration party and being in the same city can do it at his old apartment for privacy. MC says he's gone 2 weeks without any masturbating and remarks how he started in 5th grade when he was still a boy. Girl inside him states that she also really loves nipple masturbation and has been doing that since she was in elementary school. (so both going 2 weeks without is a big deal for them) MC loves the nipple toys, the Tingoo feels really good and is now super excited to feel something inside her pussy. Dildo used is pressure activated and begins to spin inside her pussy. MC eventually passes out from the pleasure. Wakes up later and notices it been awhile as the sun is now setting. While watching the recording MC remarks about how it seems the device turned itself off after violating her pussy for awhile and how her body reacted even while being unconscious. Last page, MC talks about masturbating to the recording a few times afterwards and is surprised she was able to keep going for so long and must be because of her idol body. MC then says she still has a lot of toys to try and says she wants to know how anal will feel and ends with MC saying how happy he is to have picked this idol as his new life.
Seems ErectionMassCalibur might have plans to continue this. So please go to https://www.dlsite.com/maniax/work/=/product_id/RJ01035698.html and buy it! Let's show them we want more!