A possible concise summary is:
Toya, a teenager who was killed by God's lightning, is sent to another world with a smartphone and the ability to use all kinds of magic. He meets twin sisters Elze and Linze, who join him on his quest to learn more magic and have fun. Along the way, they encounter a cowboy named Yae, a pervert named Mike, and a duke named Ortlinde who offers Toya his wife and daughter as rewards for saving his other daughter. Toya rejects the offer and escapes with his friends, while Ortlinde tries to persuade him with a song. Toya is happy with his new life in the fantasy world.
Here are the key facts extracted from the text:
1. Toya Mochizuki is welcomed to the realm of heaven.
2. The realm of heaven is described as minimalist with more clouds and harps.
3. God introduces himself to Toya Mochizuki.
4. Toya was supposed to live for another 70 years.
5. Toya died due to being struck by one to five lightning bolts while on the toilet.
6. God offers Toya a penthouse in heaven or anything he wants as compensation.
7. Toya requests to be God as compensation.
8. Toya negotiates with God for a better deal involving a new world and an iPhone 30.
9. Toya is sent to another world with magic and adventure.
10. Toya saves two women, Elze and Linze, from an armed robbery.
11. Toya is offered tea by Elze and Linze as thanks for saving them.
12. Toya takes on a quest from the Adventurer's Guild quest board.
13. Toya sells his clothes to an insane pervert for many golden coins.
14. Toya learns magic from a book given by Linze.
15. Toya saves a butler's life using magic.
Please let me know if you need any more details or further assistance!